One advantage of the 5.56mm is that it makes a nasty wound, if it hits something solid. It will go straight through if it only hit soft tissue, but then so will any round. As for lack of stopping power, I have seen some things that would curl men's souls. The VC would dope up their troops to the point where they could not feel any pain. Attackers could be missing limbs and still charge forward. Weapons are strange things. There have been numerous occasions in the old west where men have survived several shots from a .45.

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Lord, let me be the person my dog thinks I am.