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Old 07-18-2013, 11:50 AM
BillK01 BillK01 is offline
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Another way to tell (I believe this holds true for all) is the MilSpec tube is flat on the end - while the Commercial tube has tiny slant to the end. Also the threads on MilSpec are larger than the rest of the tube while the Commercial is the same diameter the whole way.

At least this is the info I've gleaned off the interwebnet'thingy.
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