A friend has a preban Bushmaster XM15-E2S with a 20" H-bar. The lower receiver is marked "Cal. 223-5.56MM". Does this mean the chamber is a Wylde or merely that the rifle will handle both rounds equally? It will shoot sub .5 MOA with premium ammo. The barrel itself is marked "B MP 5.56 NATO 1/9 H BAR"

TIA
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