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Old December 19, 2010, 01:39 PM   #11
Senior Member
Join Date: December 29, 2004
Posts: 3,342
The times I have seen chatter in broached barrels it has been way more than a small spot, but appeared just about all the way around the barrel (and repetitively).

An inclusion in the barrel steel would be more likely to produce the localized defect in the picture.
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