The LayLax Prometheus hard piston is a reinforced piston for Tokyo Marui NGRS Ver.2 gearboxes. Recoil shock weights and harder springs put a lot of stress on a piston, and this one is built to take it.
The body is a high-tensile engineering polymer that absorbs shock, and the rack teeth are heat-treated steel. The tooth profile is cut to stop early engagement and stripping when the gearbox is cycling fast, which keeps air delivery consistent and cuts wear on the drivetrain.
Key Features
- Heat-treated steel rack teeth – resist stripping
- High-tensile polymer body – absorbs shock
- Tooth profile cut for recoil shock systems
- Drop-in fit for NGRS Ver.2 cylinder assemblies
- For Tokyo Marui NGRS M4 and HK416 gearboxes
Real-World Use Cases
This piston is for NGRS owners who are upgrading the spring or running the gearbox hard. It is also a sensible spare to keep if your stock piston has started to wear.
Pair it with the LayLax Prometheus EG hard gear set for a full NGRS drivetrain refresh.
Technical Specifications
- Type: Reinforced gearbox piston
- Body: High-tensile impact-resistant polymer
- Teeth: Heat-treated steel
- Fits: Tokyo Marui NGRS (New Ver.2) M4 and HK416 gearboxes
- Installation: Drop-in fit for NGRS cylinder assemblies
- Colour: Black and silver
UK Legal & Site Notes
Internal parts are accessories, not imitation firearms, so no defence is needed. Fitting a piston means opening the gearbox, so use a competent tech if you are unsure.
Order the LayLax Prometheus hard piston from Airsoftdirect for fast UK delivery, and ask us if you need help checking your gearbox version.



