The Primary Weapons Systems PWS Piston features 13.5x1 LH threading with a durable black anodized finish. This precision-engineered component is part of PWS's proven long-stroke piston system designed to reduce maintenance requirements in high-volume fire situations and adverse conditions.PWS 13.5x1 LH threaded pistonBlack anodized finish for durabilityCompatible with PWS suppressors on 13.5x1 LH threadsPart of PWS long-stroke piston systemMaintains AR-15 core design values with enhanced reliabilityEssential for AR-15 builds utilizing PWS piston systems this component enables suppressor compatibility while maintaining the reduced maintenance benefits that PWS piston systems are known for in demanding shooting applications.