This guide goes over how to mount Holosun 509T on the Walther PDP. The process is extremely simple depend on which version of the slide cut you have on your PDP.
The Version 1 PDP optic cut doesn't feature recoil lug to hold the plate to the slide before installing the screws. The best way to mount the Holosun 509T is to use the CH Precision 509T plate as shown below:
The front fence fully fits the dimension of the optic cut to prevent forward or rearward shift. However lateral movements will induce stress on the mounting screws without recoil lug. But there is a solution to it below:
Here is where you can get the plate by using the code BAO10OFF on CH Precision for 10% OFF
PDP version 1 slide cut: PDP 509T Adapter Plate
PDP version 2 slide cut: PDP V2 509T Adapter
I sent in my PDP slide and it took about 2 weeks to get it back. Here are my slide:
Two very deep holes are cut to work with CH Precision's proprietary PDP V2 optic plate, and there is a huge chunk removed near the rear sight.
If you want to convert your version 1 slide cut to the version 2 without having to buy a new PDP, CH Precision offers the service currently. Click here to get the service