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