The retention of the 5.56 round also comes back to money. Too much has been spent establishing the current huge stockpiles, and too many companies and individuals stand to make even more truckloads by continuing to produce it.
The manufacturers could potentially switch to a new round such as the 4.7cls, but that would mean retooling, licence agreements and all the costs associated with it.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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