The FAST AEMS adapter from the American company Unity Tactical moves the position of Holosun AEMS series optics directly from the mounting base to a 2.26" optical centerline from the rail, which is advantageous in many respects.
In the standard version, the Unity Tactical FAST AEMS adapter comes with a rail clamp with two cross bolts, and it can be optionally equipped with a FAST QD (Quick Detach) lever for quick removal.
Compared to standard height mounts, Unity Tactical's FAST optical solutions provide users with a faster sight picture, or target acquisition, respectively. When using FAST series mounts, most optics are mounted to a 2.26" optical centerline from the rail. This allows you to visually process the surroundings faster with a head-up position, which is the ergonomically correct posture for these purposes.
FAST mounts are also compatible with other equipment. You can assess the position of the dot or reticle faster while using night vision goggles (NVG), protective mask, plate carriers and other gear.