The Stripped POF-USA Gen4 P415 lower only requires a mil-spec parts kit to be completed. All proprietary and ambidextrous controls are already installed on the lower. - POF GEN 4 P415 STRIPPED LOWER - 7075 BILLET LOWER - ENHANCED BOLT CATCH - OVERSIZED INTEGRATED TRIGGER GUARD - AMBIDEXTROUS BOLT CATCH IN TRIGGER GUARD - AMBIDEXTROUS MAG RELEASE - AMBIDEXTROUS BOLT RELEASE - NYLON TENSION SCREWS - BLACK HARD COAT ANODIZED FINISH (Cerakote over Anodizing if color other than Black.) - WEIGHT: 10 oz