G
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·I was playing around on model1sales.com building my dream AR and it asked if i wanted it chambered in .223 or 5.56. I though that there were essentially the same so i decided to check it out. It turns out that .223 is actually 5.66 millimeters... does this .1 millimeter really make a difference in rifle? Because i shoot .223 through my AR which is chambered in 5.56... anyway just wondering if this is something that i was supposed to know and don't 