Harrington & Richardson BLEM Retro 604 "Air Force" Complete Upper Receiver, 1/12 Twist, Gray

These exclusive retro uppers are a throw back to the late 60's era 604s that feature a grey anodized slick sided upper recevier with a 20" parkerized 5.56 NATO barrel. The rifle length gas system and C158 BCG are paired to ensure smooth cycling and maximum durability. The later model 604 rifles also featured a mil-spec "bird cage" style A2 muzzle brake rather than the 3 prong brakes used on the previous versions. These complete uppers are hand fitted and assembled right here in the United States of America.