Without a doubt...AK47. Field striping, reliability and ft lbs of energy of the 7.62x39 i believe out weighs accuracy of the M16/AR platform. Besides, within 200yrds, my AK is pretty dedgum spot on. If I were to go out further, pull out the .300 Weatherby
One of the guns that I prefer a little over my AK is my Beretta BM-59 chambered in 7.62×51mm NATO. It is basically an M1 Garand rechambered with a 20rd box magazine attached. To shoot lead bullets out of it without messing up the barrel you have to reload them a little light. A BM-59 weighs 10 pounds before you load up the magazine. An unloaded M-16 weighs about 6 pounds, and an AK-47 weighs about 8 pounds.
That’s kinda the point of the ak47, to push the opposition out to 300 yards.