On about everything except Dan Wesson...
Yes, major deal.
Shoulder on barrel has to be just right so the sight lines up when the barrel is properly torqued. (something the factory seems to have difficulty with lately.)
Barrel to cylinder gap needs to be correct.
If chamber end of barrel needs trimming, may have to recut forcing cone.
Ejector rod-latch relationship usually needs work.
Etc.
Sam
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