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Cutting a barrel down to the max choke point

Any chance you ran across this when reading a pretty old discussion? Back in like 2010-2015, I heard of people cutting barrels to a tight spot in the bore when talking about the cheap Crosman/QB barrels as a sort of pseudo choke.
So you're wanting a "tighter" choke in a barrel that you already have? Do you know what the bore and groove size of the barrel are now? I can Choke a barrel. I choke about 90% of the TJ's liners that I finish. What is the OD?