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Lengthening a forcing cone and backboring is good IF the barrel has the wall thickness; same is true for threading fixed choke barrels - IF the muzzle has the meat, then it can be easily done by a competent smith. Mike has a good rep on Shotgun World; Briley is the 800# gorilla when it comes to chokes; you might also contact George Trulock and Carlson's for quotes.
Briley sounds a little high but they are the Mercedes of the choke tube world
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