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5.56x45mm NATO or .223 Remington. They are dimensionally similar rounds, but they are not the same.

Some AR-15 rifles have smaller throats than others. If it is too small, you'll only be able to fire .223 Remington ammunition in the firearm, as the area of the throat will be too small to accommodate the higher pressures generated by firing 5.56 NATO ammunition. If the throat is reamed properly, you should be able to fire both types of ammunition in the weapon.

There's no way to tell just by looking. If you try to fire 5.56 NATO ammunition in your AR and the primer pops out of the spent casing (in a best case scenario), get a 5.56 reamer (they're around $240). The reamer will widen the throat to accommodate the hotter 5.56 NATO ammunition.

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Charles Poole

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Q: What kind of bullet does the AR-15 use?
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