Description Sig Sauer Romeo 4T Compact Red Dot Sight, 1x20mm, M1913 Rail Interface Maximize your accuracy with the advanced reticle and ballistic holdover technology of the Sig Sauer Romeo 4T Compact Red Dot Sight. Features Designed for modern semi-automatic pistols, MSR platforms and shotguns Short and medium range engagements and recreational shooting across a wide range of calibers and light conditions Fully ruggedized and impact resistant for the toughest environments Ultra durable and lightweight 7075 aluminum main housing and components, 1.41" riser mount with additional lower 1/3 co-witness spacer Comes standard with see-through lens covers and hex bolt mount Complete Mil-Spec 810G testing, submersible up to 20 meters Runtime in excess of 100,000 hours with solar and battery usage Ballistic Circle-Dot and Ballistic CirclePlex reticle options Users can select from 4 different integrated reticle options (Dot, Circle-Dot, Dot with Holds, Circle-Dot with Holds) Unlimited eye relief to acquire aiming point and target, regardless of eye position behind sight. MOTAC (Motion Activated Illumination) powers up or down when sensing motion Uses an ultra-efficient red LED illumination for daylight visibility and extended runtime Bolt mount included Strong, lightweight 7075 Aluminum housing Waterproof, IPX-8 rated, and fog-proof.