ARO-CORE (Advanced Rifle Optic Core) is an evolution of the popular 20mm 403 and 503 series optics, featuring a new 22mm housing design that pairs seamlessly with magnifier systems. It includes a 1.63 lower 1/3 co-witness pedestal mount for ideal alignment on modern sporting rifles. Available as a 2 MOA dot or with the Multi-Reticle System (MRS) in Red, Green, or Gold, ARO-CORE delivers versatile performance for close-quarters and mid-range shooting. Product Features 22mm housing design compatible with magnifiers Multi-Reticle System (MRS) with 2 MOA dot and 65 MOA circle Red reticle with multiple brightness settings Shake Awake technology with last setting recall Up to 50,000 hours of battery life Lower 1/3 co-witness pedestal mount (1.63") Parallax-free with unlimited eye relief Durable aluminum housing with MAO finish IP67 waterproof and shock resistant Product Details Model: ARO-CORE-MRS-RD Reticle: 2 MOA Dot & 65 MOA Circle Reticle Color: Red Magnification: 1x Window Size: 0.86" Dimensions: 2.48" x 1.54" x 2.63" Weight: 3.38 oz Battery Type: CR2032 Brightness Settings: 10 Daylight / 2 Night Vision Adjustment per Click: 0.5 MOA W&E Travel Range: 50 MOA Waterproof Rating: IP67 Operating Temperature: -30? to 60? Storage Temperature: -40? to 70?