Took me a while to figure this one out! I think just about any shield mount optic will fit, but the SMSc and the RMSc are really the ones that are the same width of the slide - so no overhang. The only difference between the two mounts is that one has deeper pins than the other, but I think the pins on our XDS pistols are for the shallower standard, so either one should fit.
The holosun 407K X2 is a MODIFIED version of the shield SMSc/RMSc mount. There are NO rear pinholes and the front lug holes are shorter. So if you're feeling adventurous, you could file the rear two pins off, and file the front two a little bit less.
NOTE: If you do this, it is on YOU! Not me. If it screws up, I accept NO responsibility! All information I give you is use at your own risk.
To learn more about footprints for the different sights: https://optics-info.com/footprints-on-red-dot-sights/#tablefootprints
That whole page has a lot of information that I just spend days digesting when I should have been working
The shield footprints are used by a lot of companies, just like the RMR one is. So there should be a fair number of sights that will fit.
The holosun 407K X2 is a MODIFIED version of the shield SMSc/RMSc mount. There are NO rear pinholes and the front lug holes are shorter. So if you're feeling adventurous, you could file the rear two pins off, and file the front two a little bit less.
NOTE: If you do this, it is on YOU! Not me. If it screws up, I accept NO responsibility! All information I give you is use at your own risk.
To learn more about footprints for the different sights: https://optics-info.com/footprints-on-red-dot-sights/#tablefootprints
That whole page has a lot of information that I just spend days digesting when I should have been working
The shield footprints are used by a lot of companies, just like the RMR one is. So there should be a fair number of sights that will fit.