The FAST Offset Optic Base attaches to either the forward or rearward mounting holes in the FAST LPVO Scope Mount. Together with a FAST Offset Optic Adapter Plate"" it provides a base for attaching any number of mini red dot sights directly to the scope mount. The Offset Optic Base places mini red dot sights at a 35 degree offset from the scope tube for faster transitions. When used with the Optic Adapter Plates"" the mini red dot will have a mechanical centerline of 2.05"" above the rail.