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Post a reply || Back to The Village Arms - ask the expert Re: AR-15 Chambering:.223 or 5.56?
Message: The two are the same. .223 is a measure in iches for the diameter of the rifle bore, 5.56 millimeters is the same measurement, just in metric. 5.56x45mm (5.56mm diameter, 45mm case length) is the NATO designation. I hope this clears it up for you. Replies to this post
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