Colt MT6551 AR15 NIB

Colt AR15, model MT6551,match target, semi, 223 cal, 20 inch bbl w/ 1/7 twist, bbl crowned on end, no muzzle break or bayonet lug, A2 style buttstock w/ trap door on butt, A2 style sight, front adl elevation, rear sight adj for elevation and windage, nonremovable handle, shell deflector, front and rear swivels, overall length 38 inches, comes with all paperwork, cleaning brush, sling, one 9rd colt mag and one 30rd used mag, right handed, new in the box, extra mags available, serial number #CST007XXX