OK, for this game we only give credit if you can find a manufacturer of single shot .308 uppers for the AR-15. As Arabia says, the semiauto platform for .308 is the AR-10. The AR-10 has a longer magazine well than the AR-15.
For my next round I'm going to mention .338 Lapua, which is found in a Bohica Arms single shot upper.
In a few years when the dust finally clears and people start counting their change there is a pretty good chance that President Obama may become known as The Great Absquatulator
. You heard it first here on TFL.