Holosun ARO MRS Advanced Rifle Optic 1x22mm Reflex Red Dot Sight Gold 2 MOA Dot/2MOA Dot & 65MOA Ring Reticle Black. ARO features an all-new 22mm housing design that mates perfectly with their magnifier series an all-new 1.63 lower 1/3 co-witness pedestal mount and compatibility with a new lens cover and anti-reflection device system (available separately). The two reticle options are 2MOA dot only or 2MOA dot with 65MOA ring. Specifications for Holosun ARO MRS Advanced Rifle Optic 1x22mm Reflex Red Dot Sight: Manufacturer: Holosun Color: Black Fabric/Material: Aluminum Magnification: 1 x Objective Lens Diameter: 22 mm Reticle: 2 MOA Dot & 65 MOA Ring 2 MOA Dot Brightness Settings: 12 Eye Relief: Unlimited Adjustment Click Value: 0.5 MOA Battery Type: Lithium Metal CR2032 Battery Life: 50000 hours Water Resistance Level: IP67 Weight: 3.38 oz Package Contents: Holosun ARO MRS Advanced Rifle Optic 1x22mm Reflex Red Dot Sight Holosun ARO-MRS-GD: ARO MRS Advanced Rifle Optic 1x22mm Reflex Red Dot Sight Gold 2 MOA Dot/2MOA Dot & 65MOA Ring Reticle Black