The Trijicon Thumbscrew Mount fits the 3.5 x35, 4x32, 5.5 x50 ACOG, 1x42 Reflex (with ACOG bases), and 1-6x24 VCOG. Mounts optic to Picatinny rail with two thumbscrews. Weight = 4.0 oz. Overall Length = 3.50 in. Height of Mount to
Optical Axis: 3.5 x35, 4x32 and 5.5 x50 ACOG = 1.535 in; 1x42 Reflex (with ACOG Bases) = 1.506 in; 1-6x24 VCOG = 1.535 in.