Quoted:
Is the threading suitable for a suppressor?
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As-is, I would say no. The issue isn’t the thread pitch. Rather, it is a lack of an adequate shoulder at the rear of the threads. The shoulder is really only as tall as the thickness of the comp, which is made of a very thin tubing.
With that said, the muzzle appears thick enough, and the threads shallow enough that it should be possible to turn the existing threads off with a lathe and have enough meat remaining to turn an appropriate thread pitch, such as 5/8-24 or .578-28.
If I were to have this done, I would then have a new comp made to screw onto these new threads. It could be made to the same external dimensions as the original, but it would then be thicker. Use a small set screw on the bottom of the comp where the factory dimple is located.
You then have an original appearing comp that is capable of being removed for suppressor use when desired.