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1/30/2013 3:36:02 PM EDT
both come from AR15's

top is a 9mm barrel, bottom is a standard 5.56 barrel (1/2x28 for reference)

https://dl.dropbox.com/u/59849/pics/auctions/9mm%20upper/Picture%20177.jpg
1/30/2013 3:46:42 PM EDT
[#1]
Can't see the pic but standard for 9mm is 1/2x36.
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