UTG Pro OP3 Micro SLS Red Dot Sight 4 MOA Black. NOTE: We recommend to tighten the #6-32 or #4-40 screws with torque value of about 12 inch-lb and the side plate screw with torque value of about 35 inch-lb. Specifications for Leapers UTG Pro OP3 Micro SLS 4 MOA Red Dot Sight: Manufacturer: UTG Pro Color: Black Finish: Matte Fabric/Material: Aluminum Magnification: 1 x Objective Lens Diameter: 24.17 mm Reticle: Single Dot Illumination Color: Red Brightness Settings: 8 Eye Relief: Infinite Adjustment Type: MOA Adjustment Click Value: 1 MOA Emitter Type: Open Parallax: Infinity Lens Material: Glass Optical Coating: Large FOV Multi-coated Glass Lens Battery Type: CR1632 Lithium Metal Battery Quantity: 1 Water Resistance Level: IPX-7 Length: 45.89 mm Width: 27.93 mm Height: 26.02 mm Weight: 1.8 oz Package Type: Box Lens Finish: Multi-Coated Quantity: 1 Tube Diameter: 24.17 mm Red Dot Sights-Footprint: RMR Features of UTG Pro OP3 Micro SLS 4 MOA Red Dot Sight: Precision Machined from 6061-T6 Aluminum and Finished in a Matte Black Anodization Red 4.0 MOA Single Dot with 8 Brightness Intensity Settings Manual or Automatic Dot Brightness Intensity Adjustment via Surrounding Light Sensor Side Loading Battery Compartment No Longer Necessary to Remove Sight and Re-zero when Replacing Battery 15000+ Hours Battery Life at Middle Brightness Setting Crisp 1 MOA per Click Adjustment Large FOV Multi-coated Glass Lens IPX7 Waterproof Rated Includes Removable Low Profile Picatinny Mounting Base Mounting Base Interface Uses the Common RMR Footprint Optic Height Co-witnesses with Most Suppressor Height Iron Sights Tertiary Aiming Point Laser Engraved on Rear Face of Optic Hood Compatible with Most Optics Ready Pistol Systems Package Contents: Leapers UTG Pro OP3 Micro SLS 4 MOA Red Dot Sight UTG Pro OP-RMR20CTS: OP3 Micro SLS Red Dot Sight 4 MOA Black