KAC's line of Micro Iron Sights are currently in use by the United States Army, Marine Corps and numerous law enforcement agencies worldwide. This is because they are built to exacting tolerances, maintain their zero under adverse conditions and, when folded, have one of the lowest profile top-rail footprints in the industry. Originally designed for the US military's SOPMOD rifle enhancement program, the KAC M4 Folding Front Sight is a low profile backup sighting solution that is designed to be attached to the top rail of a rifle's handguard. When stowed in the folded position, the M4's sight base extends back to envelope the front sight leaf on the right and Mfg: Knights Armament SPECS: Fits - Picatinny Rails. Material: Steel & Aluminum. Elevation Adjustable: Yes. Windage Adjustable: No.