Mission First Tactical Tekko Metal AR15 Carbine 7 IN Drop In Integrated Rail System -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 7" lightweight 6061 aluminum construction is hard coat anodized. Made in the USA, No Gunsmithing, drop in screwless installation, held in place by Delta ring and handguard cap with no permanent alterations to r; 4 MIL-STD 1913 Picatinny Rails provide a secure platform for mounting Picatinny accessories ; Monolithic style continuous top rail; Lightweight 6061 aluminum construction is hard coat anodized ; 7" carbine handguard replacement;