The Tekko Polymer AR15 Carbine M-LOK Rail System replaces the plastic factory handguard in minutes and requires no gunsmithing. No permanent alterations need to be made to the rifle its adrop in screwless installation, the unit is held in place by the Delta ring and handguard cap. M-Lock provides a secure platform for mounting Picatinny rails and accessories such as vertical grips, lights, lasers, bipods and other rail mounted kit. One QD mount built in for right handed shooters, sorry lefties you'll have to buy the M-Lock QD accessory. A monolithic style continuous top rail eliminates the gap between the receiver and rail. MFT's proprietary polymer ensures heat and impact resistance.