Does anyone know the correct Allen wrench / torx size to remove the rear sight plate screws ?

You must remove this plate to mount your red dot sight.

On this model you must remove the striker assembly to gain access to the screws.

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I was able to find out the information.
For anyone else the size is 5/64 .
Very small broke one Allen wrench off trying to remove screw. Then after a few hours trying to fish out the broken tip .
Was able to remove the screw. To remove the rear sight to remove the red dot plate cover.

I may have a later model x compact, but it was a 3/32 hex key, mighty tight so used a t handle and got it out.