Dead Air Silencers P-Series Piston M13.5x1LH Black. Designed for use with the P-Series Booster Assembly and spring this piston ensures reliable performance on tilting-barrel handguns making it a versatile addition to your setup. Specifications for Dead Air Silencers P-Series Piston 1/2x28: Manufacturer: Dead Air Silencers Color: Black Features of Dead Air Silencers Dead Air P-Series Piston: Adapts silencers to a variety of threaded pistols Compatible with the Primal (with P-Series adapter) Wolfman and Ghost 45 Designed for use with P-Series Booster Assembly and spring Perfect for tilting-barrel handgun applications Provides seamless integration for enhanced silencer performance Package Contents: Dead Air Silencers Dead Air P-Series Piston Dead Air Silencers DA402: P-Series Piston M13.5x1LH Black