Colt Licensed Full Metal M4A1 RIS Carbine w/ Crane Stock Airsoft AEG Rifle Gearbox:HPA Fusion Engine Lower Pressure Output: This piston

Lower Pressure Output: This piston shim stack is preset to make the regulator output pressure 250-300psi

20g @ 145psi — full range (below 280fps to 480fps) achievable with a single nozzle just by adjusting pressure

suitable for FPS ranges up to 500 FPS

Can come Optioned with the selector switch opening filed down in order to be compatible with standard M4 selector switches

If you want a rifle that feels solid

Colt Licensed Full Metal M4A1 RIS Carbine w/ Crane Stock Airsoft AEG Rifle Gearbox:HPA Fusion Engine Lower Pressure Output: This pistonThe Colt Licensed Full Metal M4A1 RIS Carbine is a classic, field ready M4 platform with a full metal receiver set, quad rail handguard, detachable carry handle, and adjustable CRANE stock. Patterned after the traditional Colt M4A1, this rifle gives players a realistic external feel with the upgrade potential of a Version 2 gearbox. Key Features Fully licensed Colt trademarks Full metal upper and lower receiver, barrel assembly, and two piece quad