The Silencer Co Piston M13.5x1 LH XL is a silencer accessory designed for compatibility with suppressors using a left-hand thread pattern of 13.5x1. This piston is a key component in optimizing silencer performance.Key FeaturesThread Pattern: Features a 13.5x1 LH thread pattern for precise attachment to compatible suppressors.Safety: Designed as a silencer piston to ensure secure and effective operation.