Machined to tighter than Mil-Spec tolerances, GGP's Forged Lower functions with nearly all available AR-15 parts kits and lowers. It is fachined from forged 7075-T6 aluminum with M4 feedramps, .250" takedown pin holes, and engraved T-marks. NOTE: Requires dust cover, forward assist, charging handle, barrel, handguard, gas block, muzzle device, gas tube and BCG (Bolt Carrier Group) to complete.