USED Rotapoint Gancho T30 Red Dot Sight Mount FDE T30-FDE. Two bosses and two 6-32 threads. Right-handed. Includes pocket for spare 5.56 AR extractor spring to place upward pressure on CR2032 battery on Gen 1 Trijicon RMR. Fits Geissele Super Precision and Reptilia AUS 30mm / 0 MOA mounts. 1.535in height. Places RMR at same height over bore as primary optic for consistent cheek weld. Specifications for Rotapoint Gancho T30 Red Dot Sight Mount: Manufacturer: Rotapoint Color: FDE Finish: Type III Hardcoat Anodized Fabric/Material: Aluminum Tube Diameter: 30 mm Red Dot Sights-Footprint: RMR Optic Cut: Not Applicable Hand: Right Weight: 1.2 oz Package Contents: Rotapoint Gancho T30 Red Dot Sight Mount Rotapoint T30-FDE: Gancho T30 Red Dot Sight Mount FDE