The Viridian RFX44 is a compact enclosed-emitter green dot with a native Aimpoint ACRO footprint, and it ships with an RMR-footprint adapter so it can also mount on RMR-cut slides. The sealed housing keeps the emitter clear, and it projects a 5 MOA green dot. Features: Compact enclosed-emitter green dot 5 MOA green dot Native Aimpoint ACRO footprint Includes an RMR-footprint adapter for RMR-cut slides Instant-On motion activation 6061 aluminum housing, unlimited eye relief 1 MOA adjustment clicks Mounts directly on ACRO-cut slides, or use the included adapter for RMR-cut slides. Confirm your slide's footprint before ordering.