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Army Rangers use 10" barrels on their M4s, using longer barrelled weapons to fire heavier calibers (7.62 NATO out of a M110 or M21 etc). 5.56 is not really all that great of a round, but its small and light so it can be carried in large numbers. Shot placement, of course, is the most critical element of a round's lethality. Though 5.56 (55gr) doesn't transfer energy very well to begin with, the faster it's moving, the less likely it is to STOP the target immediately (it will overpenetrate instead). I have heard that 77gr hits hard enough to see good results, though.

[QUOTE="naaman, post: 1761601, member: 5574"] Army Rangers use 10" barrels on their M4s, using longer barrelled weapons to fire heavier calibers (7.62 NATO out of a M110 or M21 etc). 5.56 is not really all that great of a round, but its small and light so it can be carried in large numbers. Shot placement, of course, is the most critical element of a round's lethality. Though 5.56 (55gr) doesn't transfer energy very well to begin with, the faster it's moving, the less likely it is to STOP the target immediately (it will overpenetrate instead). I have heard that 77gr hits hard enough to see good results, though. [/QUOTE]

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