Short Stroke Gas Piston Operation. DualFeed --(Accepts all AR15/M16 Mags & M27 Link) Quick Change Barrel 16.25" Chrome Lined 1:7" 9.45 lbs. 5.56 x 45mm NATO 7075 T6 Billet Upper Feed Cover and Charging Handle Enlarged Trigger Guard Dry Film Lubricant Applied to Critical High Friction Surfaces MIL Spec H3 Buffer Steel Feed Tray Semi Auto Handguard style: MIL STD 1913 Rail or MLOK Rip Brake Muzzle Comp MCR Extended Bolt Catch Quick Change Barrel handle Includes: M27 NATO Links(100) Magazine Adapter 30 Rd. Magazine Operator's Manual Cable Loc Mfg: Fightlite Industries