The OSight SE is a compact enclosed-emitter reflex red dot sight for pistols, finished in matte black. It projects a 2 MOA red dot for fast, both-eyes-open target acquisition on optic-ready slides. Key specs: Dot color: Red Dot size: 2 MOA Reticle: 2 MOA dot + 32 MOA circle, multi-reticle Emitter: Enclosed Footprint: RMSc (Shield RMSc / Holosun K) Finish: matte black Battery: Replaceable side-load Mounting hardware included Supported footprints: RMSc footprint (Shield RMSc / Holosun K pattern). Confirm your slide's optic cut matches the listed footprint before mounting.