I would go with the 4 Inch barrel you have located.
In the last 20 years my 3 Inch 625 has been a 3 Inch, then a 5 Inch for IDPA, then back to a 3 Inch, and now it is a 4 Inch shooting ICORE Limited.
The thing is I still have the factory 3 Inch Barrel, and it can be put back again.
I would not modify your 57 where it could not be easily put back into original condition.
I would rather have a 57 with a 4 Inch barrel. I would have no interest at all in one with a custom bull barrel. Most here would probably agree with this. Put the 4 Inch barrel on it, and keep the 8-3/8 barrel.
Bob
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ICORE MO2908
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