FN America FN15 M4, Military Collectors Series, Semi-automatic Rifle, 223 Rem/556NATO, 14.7" Barrel (16" OAL with Pinned Brake), 1:7 Twist, Carbine Length Gas System, Black Finish, 6 Position Collapsible Stock, Knights Armament M4 Carbine Rail Adapter System (RAS), Vertical Grip Included, 30 Rounds, 1 Magazine 36318 • Action: Semi-Automatic • Capacity: 30+1 • Finish: Matte Black • Sights: FT: A2 Post RR: Adjustable Iron • Barrel length: 16 • Overall length: 30.5-34.2 • Button Broached Chrome-Lined Barrel/ 1-7 TwistChrome-Lined Barrel Permanently Fixed A2 Comp. Knights Armament M4 Rail • Action: Semi-Auto • Capacity: 30 + 1 • Finish: Matte Black • Sights: A2 Front/Back Up Rear • Barrel length: 14.7" • 15in Free-Float MLOK Rail/ Ambi Bolt Release