The Silencer Co Piston .30 Carbine is engineered for seamless integration with SilencerCo threaded barrels. With a length of 2.1 inches, this piston is made from 17-4 stainless steel and is heat-treated for maximum durability. It is part of the Nielson device, which facilitates semi-automatic cycling and unlocks pistol barrels.Key FeaturesThread Pattern: Features a 5/8"x24 thread pattern, compatible with SilencerCo barrels.Durable Construction: Made from 17-4 stainless steel and heat-treated for enhanced durability.