Silverback TAC41 Variable Mass Piston (Red) w/ Piston Cup NBR 70 (Black)

Silverback 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 with 15 different configurations. Suitable For Silverback TAC41P Series Airsoft Sniper Rifle