Holosun Technologies ARO EVO & HM3X Magnifier, Red Dot, Special Purpose Reticle, Fits 1913 Picatinny Rail, Lower 1/3 Co-Witness Mount, Black ARO-EVO-SPR-RD-HM3X ARO-EVO is the ARO (Advanced Rifle Optic) EVOlved. ARO-EVO features a brand-new 26mm housing design that provides a larger sight picture, giving the user more information for improved performance shooting, along with Holosun's new lower 1/3 co-witness pedestal mount. The newly designed housing perfectly integrates with their magnifier series and includes a new lens cap and anti-reflection system. Additionally, AROEVO is available with their new Special Purpose Reticle (SPR), which is a bullet-drop compensating and ranging reticle that balances the performance of a 2MOA dot with accuracy at intermediate distances. ARO-EVO can be equipped with their Special Purpose Reticle or a 2MOA dot, available in Red, Green, and Gold.