The Bravo Company Manufacturing (BCM) Complete AR-15 Lower Receiver is built to strict Mil-Spec standards, ensuring full compatibility with a wide variety of AR-15 parts and upper receivers. It comes fully assembled and ready to pair with any Mil-Spec upper, making it a hassle-free foundation for your next build. Crafted from durable 7075-T6 aluminum, the receiver is finished with a tough black hardcoat anodizing for added protection. It includes an enlarged polymer trigger guard, a BCM pistol grip, and the Mod-2 SOPMOD widebody stock for enhanced ergonomics. At the heart of this lower is the MK2 buffer system, which bridges the gap between rifle-length and carbine-length setups. This innovative system provides the length of pull of a rifle stock with the adjustability of a carbine, while also boosting reliability and reducing felt recoil—especially when used with short-barreled rifles.