The 20-LR pmags should make the DPMS/KAC rifles much more viable.
If I was getting a 16 inch 7.62 rifle, I'd just get some kind of AK in 7.62x39. As long as you get a lighter barrel contour and don't overload the rifle, a 20-inch .308 AR is going to weigh less than any other 7.62 rifle in a similar configuration, and mounting optics on it is really simple.
DPMS makes a rifle called the LR-308C, which is a bit like a 7.62 M16A4.
http://www.dpmsinc.com/store/products/?prod=5113
There are only two real downsides to the LR-308C, the lack of chrome lining in the barrel, and the use of a heavy profile under the handguards. Companies like ADCO can recontour a barrel down to a government or lightweight profile though.
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