well, I know that US special forces specificaly, Delta, have had their M4's chamberd for a new 6.8mm round 120gr. bullet at 2,700, with a 100gr. AP @3000fps, which uses the current magazines with only re-barreling.. After afganistan and Toras Bora, they realised the 5.56mm was pretty useless past about 200m, but then what can you expect using a 14" barrel?
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