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