I would say that for self-defense, an AR chambered for .223 is a better choice for CQB (ala "self-defense") than one chambered for the .308. The 308 to me is more of a "reach out an touch someone" kind of cartridge, whereas the 223 is an "in your face" kind of round. I may be the last of the Mohicans for thinking and saying this, but I consider the 223 to be just fine for CQB and short-medium range engagements. I consider the .308 better suited for medium to long range engagements, which in my opinion are NOT self-defense distances.
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