Re: First Firearm Thread.
There IS a difference between .223rem and 5.56 NATO, a quick google search will give you a plethora of articles explaining the difference. From my understanding 5.56 NATO does produce higher pressures in the chamber than .223rem. That being said, most AR varients will run both .223Rem and 5.56 with no issues. I've ran 1000s of rounds of each through my RRA AR-15 and never had a problem.
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