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 features the Auto Lock Lever System with has the following advantages:Does not require proprietary tools for adjustmentCan be adjusted with your fingers or a flat blade screwdriverLever can be configured to lock to the front or the rearSuperior clamping surface ensures maximum rail engagement Notes: Provides lower 1/3 co-witness with the Razor red dotProvides absolute co-witness with the SPARC red dot