That's racist, hill Billie's are resourceful people.
Barrel bending is an art practiced by top gun makers.
As some who works in engineering steels, it is very common to have to straighten sections of steel as they although from a distance look straight never are.
Cheap made gun barrels are no different, why even the bore can be not in the center on some cheap guns!
One must be careful to not assume that all things are made true!
I still don't recommend whacking a barrel as a video may suggest, there is little control with that method!