This universal mount offers multiple mounting positions so that you may attach your favorite optic to your 1913 top rail. It is compatible with most reflex sights on the market, including but not limited to: SIG SAUER ROMEO1T ROMEO1PRO ROMEOZERO ROMEO2 ROMEO3 ROMEO3MAX ROMEO3XL TRIJICON RMR SRO LEUPOLD DELTA POINT PRO HOLOSUN 507C 407C 508T SHIELD RMS RMS-C SMS