Ultimate Arms Gear Tactical 1x25 5 MOA Illuminating Red & Green Dot Rifle Shotgun Pistol Gun Compact Open Reflex Sight With Interchangeable Dual 7/8" Weaver/Picatinny & 3/8" Dovetail Rail Base Mount Dot Size: 5 MOA / Click Value: 1 MOA / Battery Type: CR2032 3V (1) / Weight: 4.5 oz / Length: 4.06" / Mount: 7/8" Weaver-style and 3/8" dovetail Polymer construction of the sight keeps it lightweight which is ideal for smaller platforms. In addition, the QD knobs on the sight make it extremely easy to transfer across multiple lengths. Open Circular Lens Design, Low Profile Mount. The sight has unlimited eye relief and the LED illumination is completely safe for the eye. Easy to Install.