Holosun Technologies AEMS X2 Pro, Gold Dot, 2 MOA Dot with 65 MOA Circle, Fits 1913 Picatinny Rail, Lower 1/3 Mount, Black AEMS-PRO-X2-GD AEMS PRO X2 enhances the AEMS platform by increasing accuracy with an advanced optical system that cuts parallax by 50%. AEMS X2 PRO also features a forward-facing light sensor that creates a smarter AUTO Mode, improving dot contrast in varying lighting conditions while in AUTO Mode. Additionally, AEMS X2 PRO includes a new anti-reflective device and a completely new four-post, lower 1/3 co-witness mount. It remains backwards compatible with original AEMS mounts.