Osight XR Enclosed [red]This red dot uses the Trijicon RMR footprint standard. Osight XR is a closed emitter red dot made for real use, not just for spec sheets. It uses the Trijicon RMR footprint, so it fits a wide range of full size and compact pistols that are cut for RMR or use an RMR compatible plate. The enclosed design also gives the optic better protection against water, dust, lint, and everyday carry mess. Why choose Osight XR? This optic combines a durable enclosed