The RFX 35 has an RMR footprint. This optic has a bright green 3 MOA dot and have shake awake, has a bottom mounted battery and made of 6061 T6 Aluminum. 3 MOA Green Dot 22x26 mm viewing window RMR Mounting Footprint & Picatinny mount included Auto shut off and INSTANT-ONA(R) technology High-grade aluminum alloy body, lightest in its class Designed from the ground up to ensure clarity, solid function, and rapid target acquisition Designed to fit full-size handguns, shotguns, and rifles With 2 night vision brightness settings, the RFX35 is the perfect optic for your pistol in any light condition Tested in the harshest conditions to ensure your optic will be ready whenever you need it 8 Visible & 2 Night Vision Brightness Settings