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Sorry, I neglected to mention this before. When your are pushing and pulling a bronze brush through a barrel, it is critical that all of the brush completely exits the barrel, before you reverse it and pull or push it back into the barrel. If you reverse the brush while it is still in the bore, it can damage the bore at this location!
Even so, this is still a wrong practice as it weakens the bristles and you could damage the crown in the long run. Also, those who do not use a bore guide may well leave some gunk in the lug recesses. There is only so much cleaning that a lug recess cleaning kit will do.
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