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I have the feeling it's just too good to be true that you could by a m16 FA and drop whatever upper in different calibers you want on it...
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You'd be surprised to learn, then, that this is why IMHO the M16 is THE machinegun to own. I bought mine for exactly this reason. I have shot it in lots of calibers including 5.56mm, 9mm, .22lr, 5.45x39.... I don't know that I'd want to try shooting it in Auto with some of the calibers you listed but hey, it's your gun...