Local slide milling

[Slowhand]

I presume you have a flush cut barrel? I have not heard of anyone ever adding length to a barrel, so definitely not something I would be willing to try unfortunately. Some .22 models nowadays have smaller internal threads that recess into the slide and then an adapter to sit outside of the slide, the Sig P322 for one.

That is probably the best solution and is certainly something we could do. It would be $175 for this service leaving the threads raw, $225 to coat the whole barrel afterwards

Thank you! Thats exactly the expertise I need. I wasn't sure how to fit a suppressor on a flush cut barrel.
... And now after some googling it seems the P322 adapter must be removed with a wrench to field strip the firearm. Arggg if only Sig would make the threaded barrels again.