USGI M16 A1 barreled upper receiver with all G.I. components… Does NOT include bolt carrier group or charging handle. Colt upper receiver with CK forge code (Colt/Kaiser Aluminum). Receiver shows some wear after 40 years. Colt 1/12 twist 20 inch barrel with A1 birdcage flash hider and either a Colt or BFI front sight base. Barrel marked ” C MP CHROME BORE”. Very good to excellent bore condition. Hand guards are serviceable but will show wear with some gouges and possible broken ears. Butt stock is missing butt plate, rear swivel, and screws. Includes items pictured. These are from the early 1970s. Perfect for a retro M16 A1 build.