While the XM806 was evolving into a promising battlefield system, it program delays and ultimate disinterest led to its cancellation. In turn, the US Army furthered the M2A1 mark for the Browning M2 line which brought about use of a Quick-Change Barrel (QCB), reduced muzzle flash and other refinements over the original, long-running weapon. It was expected that some 45,000 M2s were to be "modernized" to the new M2A1 standard.
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