Holosun 407/507K Adapter Mount RMR Cut Black KPLT507C. Specifications for Holosun 407/507K Adapter Mount: Manufacturer: Holosun Red Dot Sights-Footprint: RMR Optic Cut: Trijicon RMR Fabric/Material: 7075-T6 Aluminum Color: Black Length: 1.78 in...