Silverback TAC-41 Variable Mass Piston – Adjustable Power

The Silverback TAC-41 Variable Mass Piston is engineered for shooters who demand tuning control without sourcing multiple pistons. This modular system lets you adjust muzzle energy precisely by swapping aluminium and steel flyweights, making it ideal for milsim events with varying site limits and target shooting where consistency matters.

Key Features

• Variable mass configuration – 15 settings from 39 to 135 grams for fine-tuned energy adjustment
• Premium CNC construction – aluminium 6061 T6 piston head and body with steel piston end for durability
• Modular flyweight system – four aluminium and four steel CNC-machined pieces for easy reconfiguration
• NBR piston cup (70°) – reliable seal across temperature and use conditions
• Complete upgrade kit – includes PTFE grease and installation tools for hassle-free fitting

Real-World Use Cases

Milsim players benefit from tuning down energy for indoor sites whilst maintaining performance at outdoor ranges on match day. Tuners and target shooters appreciate the precision: dial in the exact FPS needed to match field limits or optimise consistency across multiple engagements. Whether you’re chasing site compliance or maximising accuracy at distance, this piston removes the guesswork.

Technical Specifications

• Piston head: CNC aluminium 6061 T6
• Piston body: CNC aluminium 6061 T6
• Piston end: CNC steel
• Cup seal: NBR, 70° hardness
• Flyweights: 4 × CNC aluminium, 4 × CNC steel
• Mass range: 39–135 grams across 15 configurations
• Lubrication: PTFE grease (supplied)
• Compatibility: Silverback TAC-41 platform

Compatibility & Upgrades

This piston is designed exclusively for the Silverback TAC-41 platform. It pairs well with upgraded springs, air nozzles, and hop-up units if you’re building a high-performance setup. The modular design means you can swap configurations in minutes without breaking down your rifle, making field adjustments between games straightforward.

UK Legal & Site Notes

All airsoft upgrades must comply with UK site rules. Most venues operate a 1.14 J (≈500 FPS with 0.2g BB) limit for semi-automatic, though some milsim events enforce stricter caps indoors. This piston’s range lets you adjust down safely for indoor play and up for outdoor game days—always confirm your site’s limits before tuning. Improper assembly or exceeding limits can result in exclusion.

Upgrade your TAC-41 with precision engineering. Order the Silverback Variable Mass Piston today and take full control of your rifle’s energy output.