Yes the AK is a much heavier weapon, ever see a 7.62 round before? much bigger than your 5.56, the recoil on the AK is also a lot heavier, plus the 45 round banana on the AK compared to the 30 in M16. Overall, the AK is a beast compared to the M16 but it is also a lot heavier, the M16 is lighter & more "elegant" assualt rifle but all of that is peanuts compared to the new weapons of today. Almost 100 years ago during WW1, general infantry were cannon fodder, today it's cannon fodder, mines, IED, attack from above, attack from afar & out of eyesight range, how to stay alive?
The problems with M16 jamming etc. is becos that damn weapon is probably older than many of you, handed down from 1 intake to another, used & abused by recruits, even the ones kept aside for range also koyak from so many years of abuse. That's why SG Chartered Industries was set up to develop it's own SAR weapons, easier to get parts & servicing. Even though SCI was making M16 under license from US, it was still costly so they phased it out.