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A firearm chamber designed to safely accept both the .223 Remington and 5.56 NATO round. Designed to combine the accuracy of the former with the increased power of [the latter]. [Not to be confused with] a .223 Remington [chambered] weapon, which can only safely accept .223 Remington rounds. Functions similarly to a 5.56 chamber in terms of what can be fired from it.
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