American Precision Firearms Strike One, Arsenal Firearms Strike One red dot mount [11.7 mm] | type A [RMSc, DPP, Docter footprint] smith & wesson revolver the Holosun 507C X2 drops

the Holosun 507C X2 drops onto any mount or slide cut shaped to that standard

Ruger Mark II

not a single brand

Springfield XDM and Springfield XDS

American Precision Firearms Strike One, Arsenal Firearms Strike One red dot mount [11.7 mm] | type A [RMSc, DPP, Docter footprint] smith & wesson revolver the Holosun 507C X2 dropsAluminium red dot mount for the standard (non cut) American Precision Firearms Strike One, compatible with any red dot sight built to the Shield RMSc, Leupold DPP or Docter footprints whatever the optic's brand. It replaces the factory rear sight in the existing dovetail, with no optics cut or slide milling required. The full list of compatible pistols and red dot sights is below. Shield RMSc, Leupold DPP & Docter footprints accepts any red dot built