Rotapoint Gancho Red Dot Sight Mount FDE. Two bosses and two 6-32 threads. Right-handed. Fits SIG WSOA40203 30mm / 0 MOA ALPHA4 1.535in height mount as issued by US Army with TANGO 1-6T DVO. Places RMR dot at same height over bore as TANGO 1-6T for consistent cheek weld. Specifications for Rotapoint Gancho ST30 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: 1.1 oz Condition: New Package Contents: Rotapoint Gancho ST30 Red Dot Sight Mount Rotapoint ST30: Gancho ST30 Red Dot Sight Mount FDE