This red dot uses the Holosun K-series footprint standard. Essential info Footprint standard: Holosun K-series footprint standard Reticle: 2 MOA dot & 32 MOA circle [green] Window size [height x width]: 16.0 x 23.1 mm [0.63 x 0.91"] Total dimensions [length x width x height]: 41.1 x 30.2 x 25.1 mm [1.62 x 1.19 x 0.99"] The EPS-GR-MRS is a full-sized, enclosed handgun sight featuring an aspheric lens for a perfectly clear sight picture. EPS-GR- MRS has an ultra-low dot height for compatibility with most factory iron sights and utilizes Holosun’s proven K footprint. EPS-GR- MRS includes an RMR-to-K footprint adapter plate for maximum compatibility. EPS-GR- MRS features Holosun’s 650nm Green Super LED with Holosun’s MRS (Multi-Reticle System) and provides up to 50k hour battery life from a 1620 cell. EPS-GR- MRS also includes Shake Awake technology, 8 daylight and 4 night vision compatible reticle intensity settings. EPS-GR- MRS is made of 7075 aluminum and is IP68 dust and water proof. 2 MOA dot & 32 MOA Circle Up to 50,000 Hours Battery Life Parallax-free & Unlimited Eye Relief Aspherical Glass Lens with Zero Distortion Shake Awake™ Technology with Last Setting Recall 7075 T6 Aluminum Housing Solar Failsafe™ Specification OPTICAL SPECS Reticle 2 MOA Dot & 32 MOA Circle Light Wavelength 650nm Reticle Color Green Parallax Free Yes Unlimited Eye Relief Yes Magnification 1x Multi-Coatings Yes ELECTRONIC SPECS Power Source Battery Battery Type CR1620 Battery Life (Hours) 50000 Brightness Setting 10 DL & 2 NV PHYSICAL SPECS Window Size 0.63x0.91 Dimension (in) 1.62×1.19×0.99 Weight (oz) 1.4