This mount fits all VCOG's, the 1x42 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.
Distance From Top of Mounting Rail to Optical Axis:
3x, 4x and 5.5x ACOG = 1.535 in.
VCOG = 1.535 in.
1x42 Reflex = 1.506 in.