The Crimson Trace CT RAD is an open (exposed-emitter) reflex pistol red dot built for full-frame optics-ready handguns. It uses a 5 MOA green dot for fast target acquisition, with a recessed multi-coated lens set behind a large viewing window to keep the aiming point clear in varied light. Features: Open (exposed-emitter) reflex pistol red dot 5 MOA green dot Recessed multi-coated lens Large viewing window for quick acquisition Manual on/off with 8-hour auto-shutoff Designed for full-frame optics-ready pistols. Confirm your slide's optic cut matches the CT RAD footprint before ordering.