Silverback TAC41 Variable Mass Piston (Red) w/ Piston Cup NBR 70 (Black) Net-Weight-(g)_338 was originally developed as a

was originally developed as a technical concept to test new ergonomic designs for light machine guns

Prees and hold down it for approximately 2 seconds

1V Lipo battery (Not include)

Airsoft Masterpiece CNC Magwell with Rubber Bottom (Gold)

Trigger Sear & Stopper Sear

Silverback TAC41 Variable Mass Piston (Red) w/ Piston Cup NBR 70 (Black) Net-Weight-(g)_338 was originally developed as aSilverback TAC41 Variable Mass Piston (Red) w Piston Cup NBR 70 (Black) CNC 6061 T6 Aluminum Piston Head & Piston body CNC Steel Piston end Aluminum flyweight (x4) Steel flyweight (x4) PTFE grease Designed to allow the user to make fine adjustments to the FPS of your rifle by adding mass to the cylinder. When used in conjunction with different springs it can give any shooter the most FPS control possible. Adjusting the piston mass from 39 to 135 grams