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Old November 10, 2017, 09:41 PM   #8
Senior Member
Join Date: November 29, 2007
Location: Everett, WA
Posts: 6,088
I think the M-16 and its variants are the longest serving small arm and the M-2 the longest serving weapon of any kind.
That's just a guess.

On edit the longest serving weapons of any kind would be the cannon on the USS Constitution.
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