The Unity Tactical FAST AEMS (FST-AEMF) is a riser mount for Holosun AEMS sights. The manufacturer lists the AEMS (original), AEMS CORE, AEMS CORE-X2 and AEMS PRO-X2 as compatible. It raises the optical axis to 57 mm (2.26") above the Picatinny rail. The mount is anodised 7075-T6 aluminium and attaches to an M1913 Picatinny rail with two cross bolts. Dimensions 36 x 56 x 33 mm, weight 114 g.