Holosun ARO 1x Red Dot - 2 MOA Dot and HM3X 3x Magnifier Combo - The Holosun ARO (Advanced Rifle Optic) Dot Sight is an advancement on the popular Holosun 20mm 403 and 503 series optics. The ARO features an all-new 22mm housing design that mates perfectly with Holosun magnifiers and includes an all-new 1.63in lower 1/3 co-witness pedestal mount for optimal targeting performance. The Holosun HM3X line of magnifiers will allow the operator to seamlessly transition from unmagnified to 3X magnification. The Holosun HM3X features an adjustable diopter to dial in the desired focus, extremely clear glass, and very generous eye relief. Mounting options include an integrated QD mount with an optional spacer for Absolute Co-witness and Lower Co-witness. Holosun's HM3X comes in a durable Aluminum housing. ARO FEATURES: 2 MOA Dot - Red Dot: Accuracy at intermediate distances.; Up to 50,000-Hour Battery Life: Extended runtime for long-term reliability.; Shake Awake Technology: Auto-on/off feature for instant activation.; IP67 Waterproofing: Ready to perform in any environment.; Durable 6061 Aluminum Housing: Built for maximum resilience.; 10 Daylight and 2 Night Brightness Settings; HM3X FEATURES: Flip to the Side Design: Seamlessly transition from unmagnified to 3x magnification; IP67 Waterproofing: Ready to perform in any environment.; Eye Relief: 2.75in; Lens Material: Optical Glass; Weight 9.8oz; Dimensions: 3.9in x 1.6in x 2.4in; INCLUDES: Holosun ARO RD2 - Red Reticle; Holosun HM3X - 3x Magnifier; CR2032 Battery; Multi-Tool; Lens Cloth; User Manual; Dust Cover (Bikini Caps);