UTG Pro OP3 Micro 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 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: 100 yds Lens Material: Glass Optical Coating: Large FOV Multi-coated Glass Lens Battery Type: Lithium Metal CR2032 Battery Quantity: 1 Water Resistance Level: IPX-7 Length: 45.21 mm Width: 27.93 mm Height: 26.42 mm Weight: 1.1 oz Condition: New 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 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 55000+ Hours Battery Life at Middle Brightness Setting Magnetized Battery Compartment Reduces Intermittent Reticle Illumination and Flicker 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 Protective Optic Cover Included Compatible with Most Optics Ready Pistol Systems Package Contents: Leapers UTG Pro OP3 Micro 4 MOA Red Dot Sight UTG Pro OP-RMR20R: OP3 Micro Red Dot Sight 4 MOA Black