The Viridian RFX25 is an open-emitter micro reflex green dot for pistols built on the Docter / Burris FastFire / Vortex Venom footprint. It includes a Picatinny mount and features a wide viewing window. Features: 3 MOA green dot 20x28mm viewing window Open-emitter reflex design Docter / FastFire / Venom footprint Includes Picatinny mount 8 visible plus 2 night-vision brightness settings CR2032 battery, 30,000+ hours runtime, 2-minute auto-off 6061-T6 aluminum housing, IPX6 water resistance Weighs ~0.75 oz Confirm your slide is cut for the Docter / FastFire / Venom pattern, or use the included Picatinny mount.