This universal 45 degree offset mount offers the ability to retain your scope and add a reflex sight to the 1913 top rail of your scoped rifle. It is compatible with most reflex sights on the market, including but not limited to: Sig Sauer ROMEO1T, ROMEO1PRO, ROMEOZERO, ROMEO2, ROMEO3, ROMEO3MAX, ROMEO3XL, ROMEO-X PRO. Trijicon RMR, SRO. Leupold, DELTA POINT PRO. Holosun, 507C, 407C, 508T. Shield Optics RMS, RMS-C, SMS