Ballistic Advantage DCP3, Stripped Lower Receiver, 223 Remington/556NATO, Anodized Finish, Black BAPA100039 The Ballistic Advantage AR15 Lower Receiver is the perfect base for your next build. This high quality, mil-spec lower receiver is machined from 7075-T6 forged aluminum with a hard-coat anodized finish. It features a nylon tipped upper tension screw, ensuring a tight fit with any standard AR15 upper receiver, and a flared magwell for easier insertion of magazines, and the rear takedown pin detent hole is threaded for a 4-40 set screw.