[g.willikers]

Shall we take bets on the results?
My bet will be that there's no problem, whatsoever.
Other than the aggravation of seeing it, every time you look down the barrel.

I once acquired a cheap 30-06 rifle that looked every bit like a truck gun.
You know, the kind that looks like it actually fell off the truck.
The barrel was atrocious, with rust pits and scratches.
The previous owner(s) must have alternated between never cleaning it, or getting completely carried away with the cleaning rod.
But it didn't know how ugly it was and, surprisingly, turned out to be quite the shooter.