The OSight K is a compact open-emitter reflex red dot sight for pistols, finished in matte black. It projects a 6 MOA red dot for fast, both-eyes-open target acquisition on optic-ready slides. Key specs: Dot color: Red Dot size: 6 MOA Reticle: 6 MOA dot Emitter: Open Footprint: RMSc (RMR-to-RMSc adapter included) Finish: matte black Battery: Side-loading Mounting hardware included Supported footprints: RMSc footprint (Shield RMSc / Holosun K pattern). Includes an RMR-to-RMSc adapter plate, so it also mounts to RMR-cut slides. Confirm your slide's optic cut matches the listed footprint before mounting.