This Trijicon RMR Mounting Kit for Glock MOS and Springfield OSP Models will not work with a Walther PDP. The model at the link below should work. However, you will need to use the screws that come with the RMR mount from Walther.
https://www.opticsplanet.com/trijicon-rmr-mount-sealing-plate.html
Yes, the Trijicon RMR Mounting Kit will be compatible with the Trijicon SRO which shares the same footprint as the Trijicon RMR.
The Trijicon RMR Mounting Kit for Glock MOS and Springfield OSP Models will not work for a FN Five Seven or CZ Shadow. If you are looking for a dovetail mounting plate for the RMR the mount at the link below will work for a CZ Shadow. However, we do not currently have a compatible red dot mount for the FN Five Seven.
https://www.opticsplanet.com/evolution-gun-works-trijicon-rmr-sight-mount-1-780-in-aluminum.html?_iv_gun-make=cz
This Trijicon RMR Mounting Kit is a sealing plate for handguns with the RMR footprint. The Glock 43x uses the Shield RMSc footprint and would not be able to fit the RMR or this sealing plate.
For any replacement screws please contact the manufacturer found here.
https://www.trijicon.com/contact-us
If your slide is milled for an RMR, it should work just fine.
In regards to the Springfield models, this is only compatible with Springfield's OSP pistols.
MOS stands for Modular Optic System. It's a universal system that allows for different optics via mounting plates. Not all Glocks have this system though.
Yes, the HS508t has an RMR footprint.
No, this kit is only for Glock MOS and Springfield OSP firearms.