Sig Sauer ROMEO4T 1x Red Dot - Ballistic Circle Dot - Designed for modern semi-automatic pistols, MSR platforms and shotguns. Made for 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.;