This 20" A2 Gov't. Profile Upper Assembly is your perfect retro upper. It is a complete Upper Receiver Assembly - ready to snap onto your Lower. The barrel is chrome lined and machined from 4150 Chrome Moly Vanadium 11595E steel, rifled 1x9" RHT. An A2 Flash Suppressor, standard A2 Front Sight base with sling swivel and bayonet lug are fitted. The assembly includes premium quality rifle length handguards molded from a fiberglass composite for heat resistance in sustained fire - they will not deform when subjected to high barrel heat.