I've had a few builds running here lately but this one may be of interest to some. Starting with a Colt 1/12 M16 barrel cut to 16" and threaded with an old style 3-prong flash hider attached to a non M4 cut upper from Aero precision. I threw a teardrop forward assist on it for nostalgia and had this rifle hand guard in my box of goodies. The lower is your basic $39 Anderson with a PSA build kit and BCG...this one like the last is a range fun gun...the barrel was purchased from Fulton Armory and I had it threaded at Adco. It is a 605 dissipator type carbine with rifle length gas system and she runs like a sewing machine. Hope ya'll enjoy...sorry to the purist' but I wasn't going for a true to form replica.