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Old October 22, 2010, 08:29 AM   #16
Junior Member
Join Date: October 22, 2010
Posts: 1
mil-spec vs commercial -- not a problem

There is a $1 little gage for sale on Amazon that lets you tell which kind of tube you have. The gage is made by Tactical Intent, a company that is making buttstocks and rail covers. The gage is dirt easy, cheap and eliminates any question.

You can find it at:
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