Unity Tactical, FAST Micro, Red Dot Mount, 2.26" Optical Height, Compatible with CompM4/CompM4s Footprint, Anodized Finish, Flat Dark Earth NEW 7075-T6 Aluminum and Type III Hardcoat Anodized 2.26" Optical Centerline Height Standard Rail Grabber Mount Product Description FAST is a series of optic mounts and platforms that provide end users with a quicker sight picture than standard height mounts. A 2.26" optical centerline height provides faster/easier reticle acquisition while wearing electronic EarPro/communications headsets, night vision goggles and gas masks and allows for more rapid visual processing of the battlefield by promoting a heads-up posture.