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For me, it comes down to ubiquity. While 308 is used all over the world, the AR10 isn't as strictly controlled as the AR15. The larger calibers in the AR15 aren't nearly as prolific as the military cartridges are. I would be/am willing to sacrifice the ubiquity of the cartridge before sacrificing the ubiquity of the platform.
Besides, there are much more prolific platforms for the 308 a la G3, M14 over the AR10. Granted, the ergos are different, but I like my CETME (kind of wish it had the H&K diopter, but such is the compromise made to buy the inexpensive version), but I also understand that's my personal opinion.
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