well, not many smiths will attempt installing screw ins in an older weapon, especialy one with a thin barrel that they can't cut the barrel back till they have enough "meat" remaining to ream the bore out straight walled to be able to tap threads in it. This is a 1 shot deal, no second chances.
There used to be a company called thin walled chokes, that used shallower threads so you didn't need to remove as much from the end of the muzzle and the risk of getting the muzzle too thin wasn't as great.
You gould possibly get a full choke sleeve permanantly installed, use to be alot of smiths that specialized in that.
RR
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Born To Hunt, Forced To Work.
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