The AR15 Riser Mount with a quick release lever is designed for mounting the Razor red dot sight onto a flattop style AR-15 rifle as the primary optic. When used in conjunction with the Picatinny clamp included with the Razor, this mount positions the red dot of the Razor in the lower third of the field of view when co-witnessed with the iron sights. The AR15 Riser Mount provides a rise .6 inches (15.3mm) above the base surface. Weighs 3 ounces. Made with pride in the U.S.A. Provides lower 1/3 co-witness with the Razor red dot. Provides absolute co-witness with the SPARC red dot. The AR15 Riser Mount features the Auto Lock Lever System and has the following advantages: Does not require proprietary tools for adjustment. Can be adjusted with your finger or a flat blade screwdriver. Lever can be configured to lock to the front or the rear. Superior clamping surface ensures maximum rail engagement.