KAK Industry AR15 Lower Receiver K15 - Billet KAK Industries billet AR15 lower receiver is precision CNC machined from a solid block of high qaulity aircraft grade aluminum. All internal dimensions are cut to the proper military dimensions. Full M4/M16 spec fire control pocket. All receivers are media blasted and have a deep lustrious hard coat anodizing. These perfectly match our forged upper receivers. KAK Industry billet AR15 lower receivers are the perfect foundation for your next build. Machined from a solid block of aircraft quality aluminum Full M4/M16 style fire control group pocket Pictogram selector markings on both sides Accepts all standard/Milspec AR15 components Compatible with drop in trigger assemblies Tumbled, deburred, media blasted Caliber: MULTI Oversized integral trigger guard Flared magwell for faster & easier reloads Type 3 Class II hard coat anodized - deep matte black Weight 9.12 oz Excellent match with forged upper receivers