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What does M4 stand for?

M4 stands for M16 and M249


This definition appears very rarely

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Samples in periodicals archive:

The M249 is a belt-fed light machine gun. [11] It fires the 5.56×45mm NATO cartridge, usually a combination of one M856 tracer and four M855 ball cartridges fed from...
Shooting Sports News. Photos: FNH USA to Offer Semiautomatic M249 SAW and M4/M16 Rifles