CMMG MK-4, 5.56mm cal. semi-auto rifle.  Serial #SCM-101250.  Excellent condition.  16" unmarked barrel has an excellent bore, open three prong flash hider, adjustable post front sight and adjustable peep rear sight.  Quad metal ventilated hand guard with rails.  LWRC M6A1-S upper receiver.  Full length picatinny style top rail.  Near 100% black finish.  Chrome bolt assembly.  MAGPUL black textured pistol grip.  Five position adjustable and folding stock.  Comes with one 20 round magazine.  Has sling swivels.  Includes black aftermarket hard case.  Like new condition.