The Mepro MX3-T is a 3x power magnifier that attach to the Picatinny rail immediately behind the reflex sight. The Mepro MX3-T has an integrated quick-release pullback adaptor that allows it to ride to the right side when not needed. This model can be configured for the right side or left side ride when not in use and will not interfere with the weapons operating system. Simply flip it into position to engage for longer distance shots without having to re-zero your rifle. Finish Matte Black Waterproof Yes Height 2.95 Inches Length 3.97 Inches Style Tube Weight 10.1 Ounce Width 2.6 Inches Magnification 3 Eye Relief 2.2 Inches Included Mounts Yes