DPMS DP51655129036 Machined from Aluminum Forgings 7075-T6 Hardcoat Anodizing: MIL-A-8625F, Type III, Class 2 Milspec diameter Receiver Extension B5 Bravo Stock, Black B5 Grip, Black B5 Enhanced Trigger Guard, Black Staked M4 Lock Nut Standard Carbine Buffer Panther Polished Trigger (PPT) Caliber: Multi