Free Float KeyMod Rail System replaces the plastic factory handguard. KeyMod attachment system provides secure mounting for MIL-STD 1913 Picatinny Rails and accessories such as vertical grips, lights, lasers, bipods and other rail mounted kit. Will accommodate most suppressor installations. Patent pending mounting, indexing and lock up system. Larger range of modularity with offset mounting positions as well as the traditional 12, 3, 6 and 9 o'clock positions. Monolithic style top rail eliminates the gap between the receiver and rail. Minor assembly required, utilizes standard barrel nut and will accommodate a standard front sight post, low profile gas block or Picatinny Rail gas block. The KeyMod system allows for universal modularity between numerous manufacturers of accessories, and accessory rails. Lightweight 6061 aluminum construction is Type 3 hard coat anodized. THE EASIEST FREE FLOAT RAIL TO INSTALL PERIOD!