Experience unparalleled performance with the CMMG 99D17C3 5" 9MM BBL BCG Kit, engineered for serious shooters and enthusiasts. This precision-crafted kit provides everything needed for a reliable AR-15 experience. Constructed from high-quality 4140CM steel with a Submerged Arc Welding (SBN) finish, this kit offers outstanding durability and exceptional reliability, ensuring superior functionality in every shot. Precise Manufacturing Long Term Reliability Durable Construction Elevate your shooting experience with a kit that encapsulates quality, performance, and innovation.