Rugged suppressors piston uses a non-slotted design creating a full circumference gas seal.This drastically lowers gas blowback for a more enjoyable shooting experience.Machined from 17-4 stainless steel and heat treated this piston is built to last.*when using a piston on a fixed barrel platform such as a carbine or subgun the spring must be replaced with a fixed barrel spacer.Finish: CopperModel: Suppressor PistonMaterial: 17-4 Stainless SteelThread Pattern: M16x1 RHHand: Right