at3 tactical rd-50 pro red dot sight with .83" riser - for absolute cowitness with iron sights - 2 moa compact red dot scope at3 tactical red dot sight technical specs power / obj. lens: 1x23mm reticle: 2 moa red dot lens coating: multi-coated weight: 3.6 oz mounting length: 1.1 inch / 28 mm total length: 2.4 in / 61.8 mm exit pupil: 22mm battery type: cr2032 (renata cr2032 battery included) battery life: up to 50,000 hours on lowest setting. approx. 5,000 hour with typical use windage/elevation click value: 1 moa per click adj range: +/- 35 moa eye relief: unlimited parallax adjustment: fixed field of view: unlimited night vision compatible: no nitrogen filled: yes waterproof/fogproof: yes body material: 6061 aluminum finish: matte black anodized riser mount technical specs mounts on: picatinny or weaver rails length: 1.6" rail slots: 3 material: black anodized aircraft aluminum saddle height: .83" weight: 1.1oz