This mount fits all VCOG’s, the 1×42 Reflex (with ACOG base), and the 3.5x, 4x, and 5.5x ACOG’s. The AC12033 quick release mount utilizes a single lever system. It features the patented BLAC lever system which requires no manual adjustments to attain a proper, rock solid engagement on a 1913 picatinny rail.