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Discussion in 'AR15' started by JohnT, Sep 10, 2010.
Which is most popular, 223 or 556
If you are talking chamberings...5.56 Nato for the AR-15.
5.56 NATO (5.56x45mm) is by far more popular among AR platforms. .223 is generally reserved for bolt action rifles. SOME AR's have .223 stamped, but it is likely they will work fine with 5.56 NATO. I'd do a few google searches if your rifle is stamped .223 before putting 5.56 in it, though. Some one else has tried it before!