Friend, believe it.
I have seen revolvers that had serious burrs raised on the firing pin opening/port/hole, because someone kept ramming a brush end into it. Didn't take too long, either.
I have seen other revolvers that had divots literally dug out of the muzzle. This was from a gentleman who was a bit to diligent with a metal rod and JB Bore Compound.
I have seen the accuracy from a fine rifle go to crap--I mean, the rifle would do no better than 1.5 inch groups--from improper cleaning, from the BREECH.
It can and does happen. Get a good bore guide and a coated rod.
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Hiding in plain sight...
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