The Viridian RFX42 is an enclosed-emitter micro green dot built on the Shield RMSc footprint, sized for subcompact and micro-compact carry pistols. The sealed emitter resists dust and debris, and it projects a 3.5 MOA green dot that is easy to pick up in daylight. Features: Enclosed-emitter micro reflex with a sealed housing 3.5 MOA green dot Shield RMSc footprint for subcompact/micro-compact carry pistols Up to ~28,000-hour battery life 10 brightness settings, including 2 night-vision levels Instant-On motion activation CNC-machined aluminum construction One of the smallest fully-enclosed RMSc dots available. Confirm your slide is cut for the Shield RMSc footprint before ordering.