The ZEV Technologies large frame billet receiver set was designed to complement the enhanced features of the ZEV rifle product line while retaining compatibility with SR25/DPMS pattern accessories to give you the most options for completing your build. All receivers are precision-machined from solid billet aluminum and are held to extremely tight tolerances and high quality standards to ensure consistent fit and function. With its ambidextrous features, light weight, and superior finish, the ZEV Billet Receiver Set is the perfect foundation for any rifle build.Features: Machined from American-made 7075 T651 billet aluminum True black Type III Class 2 hardcoat anodize Laser T-marked picatinny rail Integrated and enlarged trigger guard Generous flare cut magazine well to facilitate quick magazine insertion Ambidextrous bolt release Ambidextrous magazine release Threaded bolt catch for ease of assembly and disassembly compared to traditional roll pins Enhanced charging handle latch locking point prevents wear to the upper receiver Compatible for use with the unique ZEV slide lock ambidextrous charging handle Compatible with the ZEV wedge lock hand guard integral anti-rotation pin for consistent alignment of the top rail Ejection port cover comes pre-installed All proprietary components are includedDETAILS Caliber: 308 Winchester/7.62x51mm NATO Material: 7075 T651 Aluminum Finish: Hardcoat Anodized Color: Black For Use With: Large Frame Rifle Weight: 21.5 oz