Roller Speargun and Inverter Accessories for Spearguns

Eagle Mono Tensioning Hook for Roller Speargun and Inverted Systems

Made from AISI 316 stainless steel, the Eagle Mono tensioning hook is designed to provide maximum corrosion resistance in marine environments, ideal for use in spearfishing and freediving.

The hook consists of three separate elements:

• a stable mounting base;
• a central body designed for precise wishbone engagement;
• a cover with a small adjustable beak that prevents accidental release of the wishbone, improving system safety and retention.

The spacing between the components is calibrated to keep the bands of a mono Roller Speargun aligned, ensuring uniform tension and effective power transmission during spearfishing.

The package includes two mounting screws, ensuring a secure and stable installation of the hook on the roller or inverted system.

Dimensions: width 26 mm, optimized for precise, compact installation without compromising strength.

Simple Pulleys for Roller Speargun - SIGAL

The SiGAL Simple Pulleys are replacement and rigging accessories specifically designed for building and maintaining Roller Speargun band spearguns for spearfishing. Sold as a pair, they are the ideal solution for anyone looking to build or upgrade their Roller Speargun system with reliable quality components at the right value for money.

The Roller Speargun System: Maximum Power Along the Entire Barrel

In traditional band spearguns, the bands work over only part of the Barrel length, limiting overall thrust. The Roller Speargun system, thanks to the pulleys, allows the bands to use the full Barrel stroke, increasing launch power by up to approximately 30% compared to a classic setup. This makes the Roller Speargun particularly suitable for hunting wary, large species such as dentex and pelagic fish.

Technical Specifications

• Pulley outer diameter: 26 mm
• Pulley groove diameter: 20 mm
• Pulley width: 16 mm
• Max groove width: 12 mm
• Pulley hole diameter: 6 mm
• Package: pair (2 pulleys)

Compatibility and Use

The SIGAL simple pulleys are compatible with standard 6 mm pulley axles commonly used in Roller Speargun builds. They integrate perfectly with SIGAL Roller Speargun muzzles for tube spearguns (26 mm and 25.4 mm diameter) and with other Roller Speargun muzzles on the market designed with 6 mm holes for axle housing. Suitable both for DIY Roller Speargun builds and for replacing worn pulleys on already rigged band spearguns.

Simple Pulleys vs Pulleys with Bearings

Compared to versions with glass ball bearings, simple pulleys offer an excellent balance between functionality and low cost, making them ideal for those entering the Roller Speargun world for the first time or for secondary-level setups. For optimal sliding performance and maximum long-term durability, SIGAL also offers a version with ball bearings, available separately.

Why Choose SIGALSUB

SIGAL is an Italian brand specialized in manufacturing high-performance spearfishing accessories and spearguns. The SIGAL Roller Speargun Line is among the most appreciated references among Italian freedivers for its build quality, attention to technical detail, and compatibility with the main band spearguns on the market.

Hard 7 - Ceramic: Pulley System for Invert Roller Spearguns

Hard 7 - Ceramic is a pulley system designed specifically for Invert Roller Spearguns, engineered to ensure optimal band organization and symmetrical load distribution across the entire speargun structure.

Thanks to its ability to keep the bands neatly arranged and balance tension, this system ensures maximum reliability and precision during tensioning. It supports the attachment of up to 5 bands, making it suitable for multiple configurations in spearfishing and sport freediving.

Technical Features

• Frame made of stainless steel, laser-cut to ensure strength and corrosion resistance in the marine environment
• Bearings made of low-friction ceramic, for smoother operation and long-lasting durability of the pulley system
• Pulley diameter: 22 mm
• Pulley height: 5 mm

Advantages for Underwater Use

The precise design and selected materials ensure balanced transmission of elastic force, improving speargun responsiveness and stability during loading. The combination of stainless steel and ceramic bearings provides high mechanical strength and light weight, essential factors for functional, long-lasting use in underwater environments.

Hard 7 - Ceramic is therefore an advanced technical solution for spearfishers looking for a reliable pulley system optimized for managing multi-band configurations on Invert Roller Spearguns.

Pair of Derlin Roller Speargun Pulleys with Ceramic Core

This pair of Roller Speargun pulleys is made from black Derlin, a strong and lightweight material, with a ceramic core to ensure greater strength under both static and dynamic load. The combination of these materials provides mechanical strength and reliability during use with pneumatic and spearfishing launch systems.

Technical Features

• Outer diameter: 28 mm
• Groove diameter: 19 mm
• Inner diameter (shaft): 6 mm
• Thickness: 16 mm

The pulley groove is specifically designed to eliminate band slippage during contraction, improving force transmission and maintaining efficiency during speargun release or freediving gear setup.

The precise fit between Derlin and ceramic ensures smooth movement and reduces wear, extending the component’s service life even under frequent use in aquatic environments.

Inverter Muzzle Kit for C4 Graphite

The Inverter Muzzle Kit is designed to allow the C4 Graphite speargun to integrate any inverted propulsion system, expanding its configuration options for spearfishing.

Each component in the kit is engineered to ensure maximum ease of use, allowing quick and simple assembly and disassembly at any time, without compromising the functionality of the propulsion system.

With this kit, the spearfisher can effectively customize their setup, improving thrust management and accuracy while tracking the target, without making permanent modifications to the speargun.

Technical Features

• Specific compatibility with the C4 Graphite model
• Modular components that are easy to assemble and disassemble
• Designed for inverted propulsion systems
• Durable materials to ensure long-lasting performance and reliability in the marine environment

LG Roller Light Tube Muzzle for Freediving and Spearfishing Spearguns

The LG Roller Light Tube muzzle is designed for mounting on cylindrical aluminum or carbon barrels with a 26 mm internal diameter. Made from solid Delrin, it delivers high mechanical strength and low weight, essential features for maintaining optimal balance during underwater use.

The system features two sealing O-rings positioned on the insertion seat, ensuring excellent watertightness by preventing water entry, thereby preserving the functionality and durability of the muzzle even during extended dives.

Technical features and benefits

• Pulleys with crystal bearings for smooth, silent rotation, increasing the efficiency of the Roller Speargun mechanics and precision when tracking.
• Low weight of just 85 grams, limiting the impact on the overall balance of the speargun while maintaining the lightness and maneuverability required for spearfishing.
• Includes the M5 pin for attaching the bands near the handle, complete with washers, nuts, and Delrin spacers to ensure long-term stability and durability without corrosion.

This muzzle allows any barrel with a 26 mm cylindrical fit to be effectively converted to a roller setup, improving power transfer and shot responsiveness in spearfishing and freediving. The use of technical materials such as Delrin and crystal bearings ensures strength and smooth operation, essential qualities for equipment dedicated to freediving and spearfishing.

Ermes M4 Axle for Pulleys

The Ermes M4 axle is specifically designed for mounting pulleys used in underwater gear, ensuring precision and reliability.

Made with a 6.0 mm diameter and M4 thread, this axle provides optimal compatibility with pulley systems commonly used in spearfishing and freediving activities.

Technical Specifications

• Axle diameter: 6.0 mm
• Thread: M4
• Available lengths: 55 mm, 60 mm, 82 mm
• Includes screws and washers for installation

Features and Benefits

The complete set of screws and washers allows for secure, stable installation, reducing play and maintaining proper pulley alignment.

The choice of three sizes lets you adapt the axle to different pulley configurations, optimizing force transmission and smooth movement throughout the system.

Single Roller Power Head Muzzle Kit - Ceramic

The Premium roller conversion kit Single Roller Power Head - Ceramic, made in Australia, is designed for installation on spearguns with a removable cylindrical muzzle. This system significantly improves power and accuracy in spearfishing, delivering greater penetration and range with superior control.

Main Technical Features

• High-speed ceramic bearings: four bearings (two per pulley) made from ceramic material with encapsulated balls, designed to reduce friction and increase power-transfer efficiency. Resistant to sand and saltwater, virtually maintenance-free. They are covered by a lifetime warranty.
• High-performance small-ID bands: 15, 16, or 18 mm bands with a 1 mm inner-diameter hole, offering high elastic performance to optimize pretension and maximize shaft thrust.
• Wraparound carbon fiber side plates: 2 mm thick, ultra-lightweight and strong, fully protecting the pulleys and bearings from impacts while improving the kit’s mechanical strength without adding weight.
• Molded one-piece body: solid and lightweight structure, designed for superior durability and balanced trim when swinging the speargun.
• Integrated line guide: allows the muzzle shock absorber to be secured and accommodates lines up to 2.5 mm thick, for versatile and safe installation.
• Complete with three types of Dyneema line: to choose the most effective setup based on your spearfishing needs.
• Rocker tie and barrel adapter: available for diameters from 24.5 to 26.5 mm, for compatibility with various speargun models.

Technical and Functional Benefits

The Roller Speargun system eliminates the recoil typical of traditional muzzles and uses 100% of the barrel length to propel the shaft, increasing power without increasing the freediver’s effort. By optimizing the ratio between band stretch and shaft weight, the kit generates more effective thrust, improving accuracy, shaft penetration, and handling of the speargun while freediving.

The lightness of carbon fiber and the low mechanical resistance of the ceramic bearings contribute to superior smoothness and responsiveness when shooting. Its simple construction makes assembly easy and ensures long-lasting reliability over time.

Compatibility and Usage Tips

• The kit is recommended for spearguns from 70 to 110 cm in length, but it can also be used effectively on 120 to 130 cm spearguns by installing 16 or 18 mm bands.
• Compatible with most Euro and South African spearguns with a removable cylindrical muzzle.
• Assembly instructions included to ensure correct and safe installation.

Invert Band Anchor Base compatible with C4 Graphite speargun

The Invert band anchor base is a technical component designed for use with the C4 Graphite speargun, specifically engineered for mounting the bands used on this model.

Paired with the Invert muzzle kit for Graphite, it allows you to adopt an inverted propulsion system, changing how band power is delivered to improve swing efficiency and recoil management during spearfishing.

Technical features

• Compatible with the C4 Graphite speargun
• Compatible with original reels and the LG Twist 80 reel, providing flexibility in equipment selection
• Quick and easy assembly and disassembly of each kit component, for simple setup customization

This anchor base is made from durable materials and designed to remain lightweight and practical in the water, ensuring optimal transfer of band force and effective hydrodynamic trim management during underwater use.

Wrist Loader for Roller Spearguns

Specific loader for use with roller spearguns, designed to make the loading phase easier during spearfishing. Made with corrosion-resistant materials, it includes a stainless steel hook to ensure a secure, long-lasting hold in the underwater environment.

The kit includes a rugged line, designed to provide reliability and practicality when managing the cord during speargun loading. This wrist loader ensures comfortable use and seamless integration with the handling and release dynamics of a roller speargun.

• Extremely durable material: stainless steel hook with high resistance to saltwater corrosion
• Practicality: strong, properly sized line for smooth handling during loading
• Compatibility: designed specifically for roller spearguns

Loader Assistant for Roller Spearguns

Loader Assistant is an accessory designed to make it easier to hook the bands when loading roller spearguns, significantly improving speargun handling.

It extends the band grip point, allowing for easier and safer loading. This extension provides better control and practicality during the band-tensioning phase, reducing effort and increasing loading precision.

Double Roller Power Head Muzzle Kit - Glass

The Double Roller Power Head - Glass conversion kit, made in Australia, is designed for those looking for a precise and functional double Roller Speargun Muzzle for freediving and spearfishing spearguns.

Design and Construction

The Muzzle features an innovative system with inline pulleys, characterized by different diameters: the front pulley is larger than the rear one. This solution prevents the Bands from overlapping and allows for compact wraparound along the speargun barrel, reducing bulk and hydrodynamic drag. The result is smoother, more controlled tracking during the shot phase.

Technical Components

• Robust main body, molded construction
• 4 pulleys with glass bearings for optimal smoothness
• Ultra-light carbon fiber side plates to reduce overall weight
• Integrated line guide, suitable for lines up to 3.2 mm thick
• Three types of Dyneema line included in the kit
• Barrel adapter available for diameters from 24.5 to 26.5 mm
• Bands available in 14 and 16 mm diameters
• Rocker linkage and detailed instructions for simple, correct assembly

Functionality

The integrated anchor point allows attachment of the Muzzle bungee. The dual line guide allows the shaft to be secured to the Muzzle, with the shooting line positionable on either the right or left side, offering greater flexibility in setups.

Configurations and Compatibility

• 2 pairs of 14 mm Bands to drive 8.0 mm shafts at high speed
• 2 pairs of 16 mm Bands for 8.5 mm shafts on 100 to 140 cm spearguns, delivering high speed and power
• Supports the use of lightweight 7.5 mm shafts with reduced pretensioning and 14 mm Bands

These options allow the kit to be adapted to the specific needs of the freediver or spearfisher, optimizing speargun thrust and accuracy.

Technical Advantages

• Minimized bulk thanks to the compact design of the inline pulleys
• Extremely low friction between the Bands, increasing propulsion efficiency
• Lightweight construction ensured by carbon fiber and the fiberglass body
• High mechanical strength and component durability
• Easy assembly and maintenance ensured by the illustrated instructions

Ermes Formula Inverter Muzzle for spearguns

Formula Inverter is a lightweight and compact muzzle, specifically designed for freediving spearguns with 26.0 and 26.5 mm diameter barrels. Made entirely from 30% glass fiber reinforced nylon, it ensures the perfect balance between mechanical strength and light weight, essential for smooth and precise underwater tracking.

Technical features

• 30 mm diameter sliding pulleys for efficient, smooth power transfer.
• Protective groove designed to keep the pulleys from direct contact and wear, increasing long-term durability.
• Nylon material with 30% glass fiber, for an excellent combination of strength and light weight.
• Compatible with inverter systems mounted centrally on the underside of the muzzle.

Applications and compatibility

The Formula Inverter muzzle is designed to be mounted on spearguns with 26.0 and 26.5 mm diameter barrels, enabling an optimized setup for spearfishing and freediving. Its structure ensures smooth power transfer and balanced trim, improving control of the gear and shot accuracy.

Pretensioning Hook for Roller Speargun and Inverted Roller Spearguns

The pretensioning hook is specifically designed for use on roller spearguns and inverted roller spearguns, ensuring secure band anchoring and optimal tension distribution.

Materials and Construction

Made from stainless steel processed with CNC press-brake forming, the hook ensures high mechanical strength and durability in the underwater environment. Stainless steel is suitable for the corrosion typical of saltwater, maintaining its structural properties unchanged over time.

Installation

It is mounted on the underside of the speargun barrel using a pair of stainless steel self-tapping screws, supplied with the product. This anchoring system makes installation and replacement of the hook easier, providing stability and safety during band loading.

Technical Specifications

• Size: Small
• Material: Stainless Steel with CNC press-brake forming
• Compatibility: Roller Speargun and inverted roller spearguns

Eagle Double Tensioning Hook for Roller Speargun and Inverted Systems

The Eagle Double tensioning hook is made from AISI 316 stainless steel, a material known for its high corrosion resistance in marine environments, ideal for underwater use in freediving and spearfishing.

Technical Features

• Made of three separate components: a base, a central body for wishbone engagement, and a cover equipped with a small adjustable beak that prevents accidental release of the wishbone
• The spacing between the parts is designed to keep the bands aligned in double roller systems, ensuring optimal tension distribution
• Equipped with 2 screws for secure attachment to the gear
• Overall width of 58 mm, an ideal size for perfect integration with double roller tensioning systems

Benefits for Freediving and Spearfishing

The modular design with overlapping plates ensures assembly precision and reliable use, reducing the risk of slipping or misalignment during band tensioning.

The AISI 316 stainless steel construction gives the hook mechanical strength and corrosion protection, ensuring durability during extended freediving sessions and typical spearfishing conditions.

The adjustable beak on the cover is a functional safety feature that helps secure the bands and makes wishbone handling easier, improving practicality when loading the speargun.

Derlin reel base for Invert Roller Spearguns

The reel base is made entirely from Derlin, a material valued for its high mechanical strength and light weight, essential characteristics for in-water use during spearfishing.

This accessory is specifically designed to ensure correct reel positioning on the speargun, preventing any contact between the bands and the frame. This helps maintain the integrity of the gear and improve its durability over time.

The base is designed for mounting LG Sub reels, Twist 80 and Twist 100 models, ensuring precise and stable installation. In addition, thanks to its compatibility with suitable screws, it can be used with most reels available on the market, offering versatility and practicality for different spearfishing setups.

Plug and Pre-Tensioning Hook Kit for Roller Systems

This kit consists of a plug designed to be inserted inside speargun barrels with a standard 26.0 mm internal diameter, and a pre-tensioning hook specifically for roller systems.

The plug is inserted into the speargun barrel to the desired position, allowing you to drill a hole at the exact point where the pre-tensioning hook is secured using the screw included in the kit. This configuration ensures precise and stable installation, essential for maintaining the correct band tension in roller systems.

Technical Features:

• Compatible with tubes/spearguns with a 26.0 mm internal diameter
• Includes fixing screw for a secure connection
• Hook optimized for roller pre-tensioning systems

This kit ensures precise installation of the pre-tensioning system, helping manage band tension efficiently and provide optimal control during spearfishing or freediving.

Salvimar Roller Speargun Muzzle for 26 mm Speargun

The Salvimar Roller Speargun muzzle is a dedicated component for spearguns with a 26 mm internal barrel diameter, designed for spearfishing and freediving. Made entirely by the Salvimar Team, this innovative muzzle improves the functionality of traditional roller systems.

Technical features

• V-shaped opening: makes shaft insertion and positioning easier, optimizing shot preparation.
• Two seats for additional bands: allow modular power configuration, increasing the speargun’s versatility.
• Pulleys compatible with bands up to 18 mm: allow the use of large-diameter bands for greater tension, optimizing thrust transmission.
• Molded construction: ensures high mechanical strength and durability even under repeated underwater use.

Applications and compatibility

This muzzle is ideal for converting commercial spearguns with a 26 mm cylindrical fitting to a roller setup. Its dedicated design ensures simple, stable installation, improving tracking and speargun accuracy.

Benefits for freediving and spearfishing

The Salvimar Roller Speargun muzzle allows a customized band-load configuration, improving release smoothness and shot efficiency. The material’s strength and light weight help maintain balanced trim and greater maneuverability underwater.

LG Crystal Pulleys for Roller Speargun Systems in Freediving and Spearfishing

The LG Crystal Pulleys are components specifically designed for Roller Speargun systems used in Freediving and spearfishing gear. Manufactured in-house by LG, these pulleys feature bearings with glass balls, ensuring high precision and mechanical strength during operation.

Dimensions and technical specifications

• Thickness 13 mm: outer diameter 26.5 mm - internal groove 21.0 mm
• Thickness 14 mm: outer diameter 26.0 mm - internal groove 20.0 mm
• Thickness 16 mm: outer diameter 26.0 mm - internal groove 20.0 mm
• Thickness 18 mm: outer diameter 26.5 mm - internal groove 21.0 mm

Bearings and package contents

The pulleys are equipped with a pair of bearings featuring hard polymer races and glass balls, materials selected to improve rotational smoothness and long-term durability—key factors for maintaining efficiency and reliability during underwater maneuvers.

Available in the listed sizes, the package contains 2 pieces, ideal for replacing or maintaining roller systems used in freediving and spearfishing activities.

Adapter compatible with Mannysub Roller Power Head muzzles

This adapter is designed to be compatible with all Mannysub Roller Power Head muzzles. It allows Roller Power Head muzzles to be mounted on any speargun equipped with a cylindrical muzzle fitting, ensuring a secure and stable connection.

Technical specifications

• Available in 5 models with outer diameters of: 24.5 mm, 25.0 mm, 25.5 mm, 26.0 mm, and 26.5 mm
• Suitable for barrels with a standard cylindrical fitting

Applications and compatibility

The adapter is ideal for anyone looking for a technical solution to adapt Mannysub Roller Power Head muzzles to spearfishing spearguns with a cylindrical mount, while maintaining maximum mounting efficiency and accuracy when tracking the speargun.

Pathos Sniper Roller Speargun Kit for Roller Spearguns with Oval Barrel

The Pathos Sniper Roller Speargun kit includes the Sniper Roller Speargun muzzle specifically designed for spearguns with an oval-section Barrel and a Float stabilizer engineered to improve balance and recoil management.

Features of the Sniper Roller Speargun Muzzle

• Open roller muzzle designed for spearguns with an oval-shaped Barrel
• Dedicated hole for routing the circular band
• Front extension designed to support the lower barb of the shaft
• Compatible with use of the retaining ring
• Allows simultaneous loading of both bands without interference

Functions of the Float Stabilizer

• Improves the overall balance of the speargun in the water
• Reduces recoil after the shot, increasing accuracy when tracking
• Makes band loading easier thanks to three loading points spaced every 13 centimeters

This kit allows you to convert the Pathos Sniper speargun from a traditional band speargun to a roller, optimizing band management and stability during spearfishing and freediving use.

Large Stainless Steel Pretensioning Anchor for Roller Speargun and Inverted-Roller Spearguns

This pretensioning anchor is specifically designed for use with Roller Speargun and inverted-roller spearguns used in spearfishing and freediving in general. Made entirely of stainless steel, it ensures high mechanical strength and long-lasting durability even in saltwater environments.

It mounts to the underside of the speargun barrel using two stainless steel self-tapping screws, included in the package, ensuring stability and the proper level of band pretensioning to keep propulsion power consistent.

Technical Specifications

• Material: stainless steel with high corrosion resistance
• Compatibility: Roller Speargun and inverted-roller spearguns
• Size: Large, ideal for larger-caliber speargun models
• Mounting: with stainless steel self-tapping screws, included

The use of quality materials and purpose-built design ensure efficient power transfer from the bands, maintaining consistent tension over time and improving accuracy and smooth tracking of the speargun.

Black Zirconia Pulleys for Roller Spearguns

The pair of Black Zirconia pulleys for Roller Speargun spearguns is built to ensure high reliability for spearfishing and freediving. The outer structure in black Delrin is machined from solid stock, ensuring dimensional precision and the strength required for underwater use.

Technical features

• Material: high-strength black Delrin, unaffected by corrosion and marine temperatures
• Maximum working load: 169 kg, significantly higher than equivalent 316 stainless steel bearings
• Rotation speed limit: 9000 rpm, more than three times higher than traditional stainless steel bearings
• Outside diameter: 28 mm
• Groove diameter (trapezoidal section): 20 mm, compatible with bands up to 16 mm in diameter
• Inner shaft bore diameter: 6 mm, intentionally larger to transfer the load to the bearing
• Thickness: 15 mm

Construction details and functional advantages

The pulley is equipped with a calibrated cap that allows the bearing to be precisely centered on the centerline, optimizing smooth rotation and reducing premature wear. The central bore, enlarged relative to the axle, shifts the working load primarily onto the bearing, improving mechanical efficiency and protecting the pulley from excessive stress.

The trapezoidal groove is designed to accommodate spearfishing bands up to 16 mm in diameter, ensuring proper grip without compromising the smoothness and responsiveness of the pulley during tracking and shaft release.

In addition, Black Zirconia pulleys require minimal maintenance, as they are highly resistant to the corrosive agents typical of the marine environment and to temperature variations, ensuring long-lasting use over time.

Double Roller Speargun Muzzle Kit Power Head - Ceramic

The double Roller Speargun conversion kit in the Premium version is designed for installation on spearguns, ensuring a reliable, precise, and powerful system.

Main Technical Features

• Ceramic bearings with high smoothness (8 total, 2 per pulley), offered with a lifetime warranty for smoother rotation and improved corrosion resistance.
• High-performance Bands with a 1 mm diameter bore, optimized to transfer power directly to the shaft with minimal energy loss.
• Wraparound side plates made from 2 mm thick carbon fiber, effectively protecting pulleys and bearings from impacts and wear without increasing overall weight.

Design and Functionality

The in-line pulley layout features a slim, lightweight profile, reducing bulk and hydrodynamic drag compared to traditional systems with side-by-side or staggered pulleys.

The difference in diameter between the front pulley (larger) and rear pulley (smaller) prevents the Bands from overlapping, improving thrust transmission efficiency and smoothness of movement.

Kit Components

• Durable stamped-steel Muzzle body
• Four pulleys with ceramic bearings
• Ultra-light carbon fiber side plates
• Integrated line guide to facilitate shock absorber attachment or use with lines up to 3.2 mm thick
• Three types of Dyneema line for different configurations
• Adjustable barrel adapter from 24.5 to 26.5 mm
• Bands with 14 mm or 15 mm small bore
• Rocker wishbone and detailed assembly instructions with explanatory images

Applications and Compatibility

The Muzzle is designed for spearfishing large pelagics and bottom fish that require high power and extended range. It is compatible with any European or South African speargun equipped with a removable cylindrical Muzzle, offering a simple, immediate solution for conversion to double Roller Speargun.

The integrated double line guide allows the shooting line to be configured on either the right or left side, increasing operational versatility.

Performance

The Mannysub double Roller Speargun system, using pairs of 14 or 15 mm small-bore Bands, can launch shafts up to 8.5 mm in diameter at high speed, while keeping recoil low and making accurate tracking easier.

This configuration is particularly suited to spearfishers who need powerful, reliable tools optimized for spearfishing in marine environments.

Pretensioning Hook for Roller Speargun and Inverted Roller Spearguns

Pretensioning hook specifically designed for the bands of Roller Speargun and inverted roller spearguns used in spearfishing. Made from CNC press-brake formed stainless steel, it ensures high mechanical strength and long-lasting performance in saltwater environments.

The hook mounts to the underside of the speargun barrel using a pair of stainless steel self-tapping screws, included in the kit, ensuring a stable and secure installation.

Technical Features

• Material: high-strength stainless steel
• Manufacturing: CNC press-brake forming for precision and durability
• Mounting system: stainless steel self-tapping screws included
• Size: Large

This pretensioning hook is designed to ensure optimal band tension management, helping improve shot response and power in spearfishing spearguns.

Spare Part Roller Speargun Muzzle for Rob Allen Spearguns

The Roller Speargun muzzle is a specific spare part component for Rob Allen spearguns or suitable for rigging other spearfishing speargun models.

Featuring large-diameter rollers and equipped with ceramic bearings, this muzzle ensures smooth power transfer and greater long-term durability by reducing friction during tracking.

The ceramic bearings improve mechanical resistance and ensure consistent performance even during extended dives, optimizing speargun accuracy and control for spearfishing.

Suitable for maintaining or improving the speargun’s technical characteristics, this roller speargun muzzle is essential for anyone looking for reliable, technical equipment specifically for freediving and spearfishing.

Pre-Tensioning Hook - Sigalsub

The Sigalsub pre-tensioning hook is an essential component for anyone looking to convert or optimize their speargun into a roller or reduced-load configuration. Made from burnished stainless steel, it ensures maximum corrosion resistance in marine environments and long-lasting durability.

Function and Compatibility

This flat hook attaches to the underside of the barrel of an arbalete speargun and allows pre-tensioned bands to be anchored. It is compatible with wood, aluminum, and composite barrels, with a mounting system that can be screwed directly into the barrel or installed using bushings. By installing multiple hooks in sequence along the barrel, you can vary the pre-tensioning point and the position of the bands, quickly managing the speargun’s power according to your spearfishing needs.

Technical Features

• Material: burnished stainless steel, resistant to marine corrosion
• Mounting: screws directly into the barrel or installs using bushings
• Hardware included: 2 stainless steel screws supplied
• Compatible with roller, inverter, and reduced-load systems
• Allows textile and metal wishbones to be anchored for band pre-tensioning
• Can be positioned anywhere on the barrel to adjust tension and power
• Made in Italy by Sigalsub

Installation Instructions

1. Position the hook at the desired point on the speargun barrel.
2. If necessary, first insert the bushing into the barrel before drilling.
3. Drill the barrel, making sure the hole is in the correct position and away from any seals.
4. Secure the hook using the two stainless steel screws supplied.
5. Hook the pre-tensioned bands onto the hook to complete the roller or reduced-load system.

System Advantages

By distributing an adequate number of hooks along the barrel, you can split the band loading process into stages, making the top loading phase easier and reducing overall effort. This solution lets you quickly customize speargun performance without modifying other components, making it ideal for spearfishers who want to adapt the power of their arbalete speargun to different hunting situations.

Tube Stopper - Hunt Technology

The Hunt Technology Tube Stopper is a precision spare part made entirely from AISI 316 stainless steel, specifically designed for roller muzzles on tube-barrel spearguns. Built with the Italian craftsmanship quality that defines Hunt Technology, it ensures resistance to marine corrosion and long-term reliability, even in the most demanding conditions.

Material and Durability

Made from AISI 316 stainless steel, the alloy with the highest resistance to saltwater corrosion available for underwater components. This choice ensures maximum durability and no oxidation even after prolonged exposure to seawater, making it ideal for intensive use in spearfishing.

Technical Specifications

• Material: AISI 316 stainless steel
• Diameter: 16 mm
• Length: 108 mm
• Screw center distance: 35 mm
• Compatibility: Roller muzzles for tube-barrel spearguns

Application

An essential component for the proper operation of the roller muzzle on tube-barrel spearguns. The stopper precisely locks and secures the muzzle to the barrel, ensuring a stable and safe connection during the shot. Ideal as an original spare part or for building and customizing handcrafted roller spearguns.

Derlin Tensioning Hook + Internal Plug for Roller Speargun Wishbone Ties - Sigalsub

This Sigalsub accessory kit consists of two essential components for anyone using spearguns with a roller system: a Derlin tensioning hook and an internal plug for roller wishbone ties. Technical components designed to ensure reliability and precision when rigging and using the speargun.

Derlin Tensioning Hook

Derlin is a high-performance technical material, valued in spearfishing for its corrosion resistance, light weight, and mechanical strength. The Derlin hook ensures safe and precise tensioning of the speargun bands, providing a stable grip during the loading phase.

Internal Plug for Roller Speargun Wishbone Ties

The internal plug is specifically designed to protect and stabilize the roller system wishbone ties, helping extend component service life and ensure proper speargun functionality. A seemingly small yet essential element for maintaining the equipment and preserving its structural integrity.

HT/RG Pretensioning Hook - Sigalsub

The Sigalsub Pretensioning Pin  is the original component designed for the Roller Speargun (RG) and Inverter (HT) propulsion systems of Sigalsub Nemesis series spearguns. A small precision accessory, essential for proper band hooking and pretensioning on high-performance spearguns.

Function and Compatibility

The pin replaces the pin that locks the barrel to the handle, creating the attachment point for the pretensioned bands of the roller or inverter system. Compatible with Nemesis HT (Inverter system) and Nemesis RG (Roller Speargun system) models, it allows the pair of bands to be hooked securely and precisely during the pre-loading stage, ensuring shot stability and repeatability.

Technical Specifications

• Application: Roller Speargun (RG) and Inverter (HT) systems
• Compatibility: Sigalsub Nemesis HT, Nemesis RG spearguns and their Carbon versions
• Function: pretensioning pin for hooking lower bands
• Material: stainless steel
• Production: Made in Italy

Why It Is Important in the Roller Speargun/Inverter System

In spearguns with a Roller Speargun and Inverter system, band pretensioning is a critical stage of loading. This pin allows the first pair of bands to be hooked directly to the barrel, starting the loading sequence correctly and minimizing effort in the subsequent stages. The result is a more powerful, accurate shot with reduced recoil.

Original Sigalsub Spare Part

Original Sigalsub component, an Italian benchmark brand for spearfishing, known for its attention to detail, quality materials, and manufacturing precision. Ideal as a spare part or for setting up commercial spearguns to be converted to a roller/inverter configuration, to be paired with the RG or HT muzzle.

RG Roller Speargun Muzzle Kit - Sigalsub

The Sigalsub RG Muzzle Kit is the ideal solution for converting your commercial band speargun into a roller speargun, delivering superior performance without having to purchase a new speargun. Thanks to the roller system, the bands travel a longer stroke than traditional rubbers, allowing for more powerful, faster, and more accurate shots with the same barrel length.

Designed and manufactured by Sigalsub, a leading company from Piedmont in the spearfishing sector, the RG muzzle combines extreme lightness, high-strength technical materials, and proven mechanics to deliver professional roller speargun performance.

Roller Speargun System: more power, less bulk

The roller speargun system allows the bands to develop a significantly longer stroke than a classic traditional band speargun. The result is a more energetic shot, with less recoil and greater accuracy on target, all while maintaining the same barrel length. A real advantage for spearfishing in low-visibility environments or when longer shooting distances are required.

Technical specifications

• Band compatibility: accommodates bands up to 16.0 mm in diameter
• Weight: only 78 grams
• Rollers: made of POM (polyacetal), a self-lubricating material with exceptional wear resistance
• Roller axle: made of stainless steel, with a tolerance of 0.5 millimeters for maximum smoothness
• Muzzle surface: smoothed to facilitate line sliding
• Pretensioning mushroom hooks: made of Derlin, a high-strength technical material, available in right- and left-hand versions

Kit contents and installation

The RG Muzzle Kit includes the roller speargun muzzle and the Derlin pretensioning mushrooms. The anchoring pin is supplied as standard and is inserted in place of the pin that secures the barrel and handle, providing the attachment point for the bands during pretensioning. The system requires the bands to be first attached to the preload mushroom—with a radiused base that perfectly matches the barrel profile—and then connected to the front anchoring point in front of the handle.

Materials and durability

• Self-lubricating POM rollers: high wear resistance, zero maintenance
• Stainless steel axle: corrosion-resistant, consistent performance in salt water
• Derlin mushrooms: tough, lightweight thermoplastic technical material
• Extremely low overall weight: 78 grams for minimal impact on the speargun’s trim

Who it’s for

The Sigalsub RG Muzzle is designed for spearfishers who want to increase the performance of their existing band speargun by switching to a roller system, without the cost of a new speargun. Ideal for those looking for greater shot power, reduced recoil, and maximum reliability in Mediterranean waters and beyond.

HT Inverter Muzzle Kit - Sigalsub

The Sigalsub HT Inverter Muzzle Kit is a highly engineered component designed for spearfishing with Inverter speargun systems. The result of two years of research by the Piedmont-based company, this muzzle is one of the most technologically advanced solutions available on the market today. The kit includes the complete HT muzzle and the pre-tensioning pegs, everything needed to set up or upgrade your speargun to a high-performance Inverter system.

Materials and Construction

The muzzle is made from glass-fiber-reinforced nylon, with a calibrated fiber content to ensure the right balance between structural stiffness and surface smoothness, essential for proper band and line travel. The upper sections and the areas around the line passage holes are reinforced to provide exceptional resistance to mechanical stress generated by high-power Inverter systems.

• Muzzle body in glass-fiber-reinforced nylon – stiff, lightweight, and resistant to marine corrosion
• 8 mm diameter central steel axle for maximum transverse rigidity
• POM rollers (polyoxymethylene / acetal) – high-stiffness technopolymer with low friction and excellent dimensional stability
• Central POM axle designed with +0.5 mm compared to the rollers, to ensure free, frictionless rotation
• Pre-tensioning pin included, to be installed in place of the pin that secures the barrel and handle
• Pre-tensioning pegs included – with a radiused base that perfectly matches the barrel profile

Inverter System and Operation

The Sigalsub HT Inverter system uses two or three pairs of bands attached to blocks/pulleys connected to the tensioning line anchored to the muzzle. One pair of bands provides line pre-tensioning, attaching laterally to the barrel via the pegs included in the kit; the following pairs are loaded in sequence.

• Powerful, clean, and accurate shot thanks to the mechanical advantage of the Inverter system
• Recoil reduced to a minimum compared to traditional systems
• Controlled loading effort despite the high power output
• Pre-tensioning system that stabilizes the line before the shot

Weight and Performance

One of the most distinctive aspects of this muzzle is its extremely low weight: only 59 grams, an exceptional figure for a component in this category. This advantage translates into optimal speargun balance, reducing arm fatigue during long hunting sessions and improving directional control even in rough sea conditions.

• Weight: 59 grams – among the lightest Inverter muzzles available on the market
• Compact shape for maximum hydrodynamics
• Excellent tracking and control even with multiple pairs of bands installed
• Made in Italy design – engineered and manufactured in Sigalsub workshops

Compatibility and Use

The HT Muzzle Kit is ideal for ambush hunting, drop hunting for large groupers, and all techniques that require power and precision. It is compatible with Sigalsub spearguns from the Nemesis HT line and with other spearguns equipped with an Inverter system. The pre-tensioning pin is installed in place of the original pin that secures the barrel and handle.

• Compatible with Sigalsub Nemesis HT spearguns
• Suitable for systems with 2 or 3 pairs of Inverter bands
• Ideal for ambush hunting and drop hunting on large groupers and pelagic fish
• Guided installation – the pin replaces the barrel/handle retaining pin