Details This Complete Palmetto State Armory Flat Dark Earth Stealth Lower is fully assembled and ready for your completed Upper! - Machined from Aluminum Forgings 7075-T6 - Hardcoat Anodizing: MIL-A-8625F, Type III, Class 2 - Milspec diameter Receiver Extension - M4 Stock, FDE - Staked M4 Lock Nut - Standard Carbine Buffer - Un-notched Hammer compatible with 9mm use - Caliber: Multi Due to state laws, this item cannot ship to California. Features - Machined from Aluminum Forgings 7075-T6 - Hardcoat Anodizing: MIL-A-8625F, Type III, Class 2