kek'd  there's a civilian version thats in .308 but the military version uses .277 fury (6.8x51). very fucking cool round.  body armor is a net negative and thats why every serious military since the cold war has used some form of body armor, because getting hit lower chest is just as lethal as getting hit high center mass (where body armor largely covers). the mcx is also designed to be futureproof so that as materials science improves and lighter body armor is developed and thus is more ubiquitous the us still can defeat it
United States