The AC22033 Trijicon Quick Release mount fits 30mm riflescopes and utilizes a single lever system. It features the patented BLAC lever system which requires no manual adjustments to attain proper, rock solid engagement on a 1913 picatinny rail. This mount is adjustable for eye relief. The scope rings can be placed in four locations along the base. Simply remove the base screws, move the rings to the desired location and re-install the mount screws.