The Tekko Metal AR Midlength Integrated Rail System replaces the plastic factory handgaurd in minutes and requires no gunsmithing. No permanent alterations need to be made to the rifle, its a drop in screwless installation, the unit is held in place by the Delta ring and handgaurd cap. Four MIL-STD 1913 Picatinny Rails provide a secure platform for mounting Picatinny accessories such as vertical grips, lights, lasers, bipods and other rail mounted kit. A monolithic style continuous top rail eliminates the gap between the receiver and rail. The 9" lightweight 6061 aluminum construction is hard coat anodized, made in the USA, with a Lifetime Warranty.