This complete Palmetto State Armory AR-15 pistol lower with SB Tactical SBA4 Adjustable Brace is fully assembled and ready for your Pistol Upper! Receiver is Machined from 7075-T6 Aluminum ForgingsHardcoat Anodizing: MIL-A-8625F, Type III, Class 27075 Receiver ExtensionA2 Classic grip, BlackSB Tactical SBA4 Adjustable Brace, BlackUSGI Classic trigger guard, BlackStandard Carbine BufferUn-notched Hammer compatible with 9mm useCaliber: Multi