I would have to say the m14 as well, and any caliber bigger than the 5.56. I have flown out to pick up U.S. guys hit with 7.62x39 and they are always really bad off or dead. On the other hand, I have had to risk my life to fly out and pick up injured insurgents hit with 5.56 ammo, and they still have fight in them. A couple of months ago there was an insurgent that shot a marine and hit him with two rounds killing him. That marine's buddy responded shooting that guy once in the abdomen, twice in the chest, and once in the head. I still had to fly out and pick him up because he was still alive. He was even eyeballing my crew members m9's on the flight back. They say the 5.56 is lighter and such, but what good is it if you have to carry more ammo, shoot more bullets, and still don't kill the s.o.b.'s?????