I have used a shotgun bore mop coated with polishing bore paste like JB's on a cordless drill . Squirt some Kroil in there every so often. Take it slow and easy.
That method works on guns where you have easy access to the chamber through the rear of the action, but not so well on a 99 unless you pull the barrel off the receiver.
"Life' is tough. It's even tougher if you're stupid." ~ John Wayne “Under certain circumstances, urgent circumstances, desperate circumstances, profanity provides a relief denied even to prayer.” —Mark Twain
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