Sig Sauer P210A Target Dovetail Mount for Trijicon RMR, Holosun 407c/507cDovetail red dot sight mount for Sig Sauer P210A Target. Compatible with red dot sights that features the Trijicon RMR SRO footprint, such as Holosun 407c 507c and others. Mounting hardware is included. Compatibility Sig P210A Target This mount for the P210 is made specifically for the U. S. made P210s. The front of the mount will need to be cross drilled to fit each individual gun. The pin from the factory rear sight may be reused as well. The hole