SHS Polygonal Polycarbonate Piston w/ Full Steel Tooth Rack for SR-25 & L85 Airsoft AEG Rifles

Upgrade the heart of your extended gearbox build with the SHS Polygonal Polycarbonate Piston with Full Steel Tooth Rack, engineered specifically for SR-25 and L85 AEG platforms. Designed for strength, lightweight efficiency, and long-term durability, this piston is ideal for high-stress DMR and support rifle configurations running stronger springs and upgraded compression components.

If you're building or reinforcing an extended Version 2 gearbox, this SHS piston delivers the reliability serious airsoft techs demand.

🔧 Quick Specs

• Material: High-strength polycarbonate body

• Tooth Rack: Full-length 19 steel teeth

• Design: Elongated polygonal lightweight structure

• Compatibility: SR-25 & L85 extended Version 2 style gearboxes

• Manufacturer: SHS

• Application: Reinforced gearbox builds / DMR upgrades

Built for Extended Version 2 Gearboxes

Unlike standard M4 AEG pistons, SR-25 and L85 rifles utilize extended Version 2-style gearboxes that require longer piston assemblies and proper engagement geometry.

This SHS piston is specifically designed to fit:

• SR-25 AEG platforms

• L85 AEG rifles

• Other extended V2 gearbox builds

• DMR and high-torque configurations

Its elongated structure ensures correct fitment and engagement within extended gearbox shells, maintaining proper timing and reliable cycling.

Lightweight Polygonal Design for Faster Cycling

One of the standout features of this piston is its polygonal lightweight body design.

The skeletonized polygonal structure reduces overall mass while maintaining structural integrity. Benefits include:

• Faster gearbox cycle speed

• Reduced stress on gears and motor

• Improved semi-auto responsiveness

• Enhanced trigger reaction in DMR builds

• Lower strain on battery and electrical components

By reducing reciprocating mass, your gearbox runs more efficiently and smoothly — especially important in precision-focused semi-auto setups.

High-Strength Polycarbonate Construction

The piston body is constructed from durable polycarbonate, a material known for its excellent impact resistance and resilience under repeated stress.

Polycarbonate provides:

• Superior shock absorption

• Resistance to cracking under heavy spring loads

• Long-term structural durability

• Lightweight performance characteristics

For high-FPS builds and upgraded spring configurations, durability inside the gearbox is critical. This piston is designed to handle demanding setups while maintaining consistent reliability.

Full-Length 19 Steel Tooth Rack

Strength where it matters most.

This SHS piston features a full-length 19-tooth steel rack, providing enhanced durability across the entire engagement surface. Unlike pistons with partial metal tooth inserts, a full steel rack ensures:

• Increased resistance to tooth stripping

• Improved longevity in high-stress builds

• Reliable sector gear engagement

• Better durability with stronger springs

The reinforced steel teeth are ideal for:

• M120–M150 spring builds (depending on setup)

• High-torque gear configurations

• DMR semi-auto setups

• Reinforced gearbox projects

For techs looking to maximize durability without excessive weight gain, this piston strikes the perfect balance.

Designed for Performance & Reliability

When building or upgrading an SR-25 or L85 platform, internal stress management is essential. The combination of lightweight polycarbonate and a full steel rack allows this piston to:

• Reduce impact shock

• Maintain consistent engagement

• Improve gearbox longevity

• Support stronger spring builds

• Enhance long-term reliability

Proper Angle of Engagement (AOE) correction is recommended for optimal performance and durability in upgraded builds.

Ideal For

This piston is perfect for:

• SR-25 DMR builds

• L85 gearbox upgrades

• Extended Version 2 gearbox rebuilds

• High-FPS configurations

• Reinforced semi-auto setups

• Gearbox overhauls requiring durable internals

Whether you're refreshing worn components or building a high-performance DMR from the ground up, this piston provides the strength and lightweight efficiency required for modern AEG performance.

Why Choose the SHS Polygonal Polycarbonate Piston?

✔ Designed for SR-25 & L85 extended gearboxes
✔ Lightweight polygonal structure for faster cycling
✔ Durable polycarbonate construction
✔ Full-length 19 steel tooth rack
✔ Excellent for DMR and reinforced builds
✔ Trusted SHS performance quality

Manufactured by SHS, a respected name in airsoft upgrade components, this piston delivers the reliability and durability serious airsoft technicians rely on.

If you're upgrading your extended gearbox platform, don’t overlook the importance of a reinforced piston. The SHS Polygonal Polycarbonate Piston with Full Steel Tooth Rack provides the strength, efficiency, and performance foundation your SR-25 or L85 build demands.

Upgrade smart. Build durable. Shoot consistently.