Diemarco, Cerro Forge upper (Canadian Colt), DPMS barrel. 24" SS fluted bull barrel 1-12 twist, m4 feed ramps, with a Knights Armament rail system. This complete upper was professionally assembled, functions flawlessly. Built with MilSpec Upper and parts, will include BCG and PRI Gas Buster charging handle. Gas block is a Troy low profile, Rifle length gastube, Knight's Armament rail with covers. The BCG is a Full auto FN unit. The bolt was purchased, installed, and headspaced with the barrel by my gunsmith. Included: 20cal Hoppes Boresnake and cleaning brushes & mops. Only fired 60 rounds through it. Barrel Info: Length: 24" Material: 416R Stainless Steel Contour: Fluted, Bull Chamber: 204 Ruger I can provide pictures upon request. Serious inquiries only, please. Price: $720 shipped and insured.