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Precision arms in Ontario can do that work. I don't know would anyone would put more holes in their barrels though, it only makes them offensively loud and hurts the resale value...
I'll echo Claybuster's remarks. If you're looking to reduce felt recoil, I'd go with lengthening & polishing the forcing cones as well as
good recoil pads as opposed to porting. I've owned both ported guns and ported chokes. Glad to be rid of both !