Holosun ARO Advanced Rifle Optic - 22mm Housing Red Dot with Low 1/3 CoWitness Pedestal The Holosun ARO advances the 20mm 403/503 lineage with a larger 22mm housing sized to mate seamlessly with magnifiers while preserving a compact footprint and a low 1.63 inch pedestal that provides a lower 1/3 cowitness for cleaner cheek welds on carbine platforms. Offered with two reticle choices - a precision 2 MOA dot or Holosun's MultiReticle System combining a dot with a circle - the ARO is supplied with a red reticle only. Power management and durability are engineered for extended field service: up to 50,000 hours of battery life, Shake Awake with lastsetting recall, IP67 waterproofing, and 50 MOA adjustment travel. Ten daylight and two night brightness settings allow use in bright conditions or while preserving night vision, and a 0.866 inch viewing window balances a compact sight picture with ample targetacquisition area. Rugged, magnifierfriendly housing, long battery life, simple controls, and a lowprofile cowitness pedestal make the ARO a versatile reddot solution for duty, competition, and generalpurpose carbines. Manufacturer Holosun.