There are large window RMR Optics, and then there&&';;s the Omega red dot sight. Featuring a huge lens window and competition-ready features, the Omega is designed to speed up target acquisition and improve accuracy without costing you an arm and a leg. We&&';;ve engineered the features you need, like a dual-MOA circle/dot reticle, adjustable brightness, and a long battery life that&&';;s extended by our innovative low-power mode with shake-to-awake technology, then matched that engineering to materials that are ready for the rigors of field use in dynamic tactical situations. Shoot better with an extra-large window dot sight from a company you can count on to have your six. The large lens on the Omega red dot sight gives you a big sight picture without blocking out your field of view-always dangerous in a duty or defensive tactical situation. This makes it the perfect pistol optic choice for shooting competitions, range work, as a duty weapon, or as a backup reflex sight on larger firearms. Features: Designed to fit plates and slides with RMR footprint Large window without obstructing field of view 1-MOA per click adjustment Shake-to-awake activation in milliseconds In The Box 1913 picatinny rail mount and screws T10 tool Adjustment tool Lens cleaning cloth One pair each of the following mounting screws (recommended torque for slide mounting is 12 inch-pounds) : 6-32 x 0.374" 4-40 x 0.25" M3.5 x 0.6 x 11mm