The Viridian RFX45 with low mount is a full-size enclosed green dot in a low-height configuration. The native Aimpoint ACRO footprint and low mount keep it close to the slide for a pistol-oriented setup, and it projects a 5 MOA green dot. Features: Full-size enclosed-emitter green dot 5 MOA green dot Native Aimpoint ACRO footprint Bundled low mount for a lower-height co-witness configuration CR2032 battery, ~50,000-hour runtime ~24 x 15.5mm window Instant-On motion activation Set up for pistol use with the included low mount. An RMR adapter for the bare optic is sold separately.