I saw the AR57 upper at a gun show a year or two ago, and I was puzzled by why it would exist. You trade in the compactness of a P90 and the economy of 5.56mm for a bigger gun that shoots more expensive and harder to obtain ammo?
A guy at the range had a .458 SOCOM upper and he let me fire off a round. That at least makes more sense than the AR57.
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