NATO's 5.56 mm standard rifle and light machine gun cartridge is under fire, following extensive combat experience in Afghanistan. Despite being of American origin, it has always been a controversial choice in the US due to its small size and lack of power.rnNow, a catalogue of complaints is building up from other users, notably British soldiers. These focus mainly on its poor long-range effectiveness, erratic lethality even at short range, a lack of suppressive effect and poor barrier penetration.
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