I think a good tradeoff would be using a 20" AR in 5.56 and using heavier ammo, like 70 or 77gr (wouldn't kick Mk318 or M855A1 out of bed either) if you were trying to "split the difference" between an M-14 clone and an M4.
Ammo availability (the first reason), weight, and availability of parts would steer me to the AR platform. A full-length 5.56 with quality ammunition and optic can shoot out to 500+ yards with decent terminal ballistics to boot. A 7.62 is gonna own the penetration/turning-cover-into-concealment game every time, but a full-sized AR would be a solid tradeoff if you were hung up on the M-14 platform.
All that said, I would not feel under-gunned or behind the 8-ball if all I could get my hands on was an M-14 style rifle and the world was ripping apart at the seams around me!
11C2P '83-'87
Airborne Infantry
F**k China!
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