Smith & Wesson M&P-15, 5.56mm NATO cal. semi-auto rifle.  Serial #SZ66889.  Excellent condition.  16" barrel, with bird cage style flash hider, has a 1/9 twist and excellent bore, adjustable post front sight and flip-up adjustable rear sight.  Picatinny style rail on the upper receiver.  99% black matte finish.  Unmarked bolt assembly.  Black ventilated round forearm.  Black checkered pistol grip.  S&W marked six position adjustable stock.  Comes with a black nylon sling and one 20 round magazine.  Includes lock, manual and maker's box without an end label.