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Old February 6, 2013, 10:07 PM   #25
AR15barrels
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Join Date: August 23, 2006
Location: Los Angeles, CA
Posts: 53
3 of those cases look like they have pull marks.
If so, that is a sign of too much gas.

Read this:
www.ar15barrels.com/prod/operation.shtml

Then look at the cases from the other side and see if there are pull marks on the rims.

Also, how many firings are those cases?
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