Silverback SRS Variable Mass Piston (Red) Net-Weight-(g)_1544 Field Strip mechanism is the

Field Strip mechanism is the same as the real steel

With Dummy Bullet Shell

Systema Steel Cylinder Unit M110 for M4/M4A1 PTW

Designed to consume very little power

Silverback SRS Variable Mass Piston (Red) Net-Weight-(g)_1544 Field Strip mechanism is theSilverback SRS Variable Mass Piston (Red) Allows the user to finely tune the the FPS of the rifle by adding mass to the piston which through a travel force, forces air out behind the BB. NBR piston cup (70 Deg) CNC AL 6061 T6 piston head CNC AL 6061 T6 piston body CNC steel piston end CNC aluminium flyweight (4 pieces) CNC steel flyweight (4 pieces) Silverback Desert Tech SRS Sniper Rifles (For Pull Bolt Only) This special piston will allow you to