This 20" A2 DMR H-Bar Profile Upper Assembly is your perfect DCM retro upper. It is a complete Upper Receiver Assembly - ready to snap onto your Lower. The Ballistic Advantage barrel is made of 416R Stainless Steel, bead blasted finished, with a 1/8 twist. A high pressure and MPI test have been done on these barrels. It is safe to fire 5.56 NATO ammunition in this upper. 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.