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I think Timothy is a bit off base here - that big of a pressure jump can (and has) lead to barrels, uppers and what not busting and blowing out when firing high pressure 5.56 rounds in a .223 chamber.
Like BAC said, most 1:9 barrels (regardless of markings) are actually a .223 chamber. Unless you're going for a high accuracy gun I'd look for something with a 5.56 chamber and a 1:7 twist rate which will a. mostly guarantee that the 5.56 marking is valid and b. allow you to shoot 69gr and heavier(longer) bullets at all temperatures with no problems...
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The will to win is worthless if you do not have the will to prepare. -Thane Yost
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