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John, this model is rated for 5.56 NATO, so it will fire both 5.56 and .223, Bud's should have this in the description. >>>> https://ruger.com/products/mini14RanchRifle/specSheets/5855.html .....Have a great day!

John, the Ruger Mini-14 Ranch will handle .5.56 no issue. Stated by Ruger and actual owners : https://www.migunowners.org/forum/showthread.php?214346-Ruger-Mini-14-owners-%96-Question-223-amp-or-556

John, this is rated for 5.56 NATO. So you can safely shoot both 223 rem or 5.56 NATO threw this one no problem. Not sure why buds doesn't clearly state this in the description. Hope this helps.