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