Everytime I hear about a 7.62x39 AR-15, I hear about reliability issues and i dont even own an AR. I think a better caliber would be Remington's new .30 Remington AR. That is considerably more powerful than the 7.62 and is more of a battle rifle. On the somewhat lower end of the spectrum is the .300 AAC Blackout. I guess the concept behind this round was to have ab AK-like round that would function well in the AR platform. Hope that helped.
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