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i was recently trying to find the elusive 1/4"/28 pitch bolt for an ar15 and the thought came to me...why oh why do military weapons m16, m40, etc have such non available thread pitch bolt size combinations? is there any way around this dilema? i went to five hardware stores before i got the name of a private vendor that specializes in machine screws..whats the story...have they never heard of the metric system?
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