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The M231 FPW is one of the most under-appreciated M16 variants of all time
Firing from an open bolt, and featuring a heavier-than-normal bolt carrier group as well as a shortened barrel, the result of Colt’s modification regime was dubbed the XM231, later officially designated the “SUBMACHINE GUN, 5.56-MM: PORT, FIRING, M231” when adopted by the Army.
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