Obviously, the two most popular cartridges for the AR-15 (we'll leave the AR-10 out of this particular discussion) are 5.57/.223 and less so 300 Blackout.
But, as we all know, there are many, many other calibers one can build/buy an AR chambered in.
Out of: 5.56/.223, 300 Blackout, 7.62x39...
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