No...if a barrel is made correctly to begin with it is "trued" by nature of being turned on a lathe. Rifle barrels are sometimes straightened after manufacturing on a fixture but they're 18-26 inches long....nobodys going to "true" a 4in barrel. As far as the rifling, running a rifling button of the correct specs through a worn bore wont cut any metal, as theres none touching the cutter....this is total BS.
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