The Holosun ARO (Advanced Rifle Optic) builds upon the proven performance of the popular 20mm 403 and 503 series, delivering enhanced compatibility and refined ergonomics. Featuring a newly designed 22mm aluminum housing, the ARO pairs seamlessly with Holosun magnifiers and includes a 1.63" lower 1/3 co-witness pedestal mount. This optic offers a crisp 2 MOA gold dot reticle for fast target acquisition and precision aiming, making it an excellent choice for modern sporting rifles and tactical applications. Product Features Advanced rifle optic based on the proven 403/503 series 22mm aluminum housing optimized for magnifier compatibility 1.63" lower 1/3 co-witness pedestal mount 2 MOA gold dot reticle for rapid and precise aiming Parallax-free design with unlimited eye relief Multiple brightness settings for day and night use Long battery life for extended operation Lightweight, durable aluminum construction Product Specifications Brand: Holosun Category: Red Dot Sights Magnification: 1x Color: Black Reticle: 2 MOA Gold Dot Material: Aluminum Wavelength: 540 nM Brightness Settings: 10 Day / 2 Night Eye Relief: Unlimited Battery Size: CR2032 Parallax Adjustment: Parallax Free Battery Life: Up to 50,000 Hours Weight: 3.38 oz