Meprolight USA M22 Bullseye MMX4 Magnifier. The transition between the two systems is instantaneous. Its rugged battle-proven construction meets or exceeds rigorous standards to function in the harshest environments. The Mepro MMX4 micro magnifier is a compact light weight magnifier that will extend the effective range of your red dot or reflex sight. Weighing in 6.9 oz. it reduces the footprint saving rail space and weight on your firearm. Specifications for Meprolight USA 56223090 M22 Bullseye MMX4 Magnifier: Manufacturer: Meprolight Magnification: 4 x Objective Lens Diameter: 24 mm Eye Relief: 2.65 in Length: 2.8 - 3.2 in Weight: 9.2 oz Meprolight USA 56223090 M22 Bullseye MMX4 Magnifier