Isn't the Kalashnikov (AK 47) the ONLY rifle of that category that can "stand up to abuse", such as desert sand, being dunked in a river, not getting "cleaned & oiled", and still keep working without fail?
Seems I've heard that over & over.... though I've never owned any such weapons...
The M-14 was a better weapon, but not really good in the jungle. Then McNamera buds needed a contract so the M-16 was adopted with the excuse that you didn't want to kill your opponet, you wanted to wound then thus tying up two fighters. Well no one on the other side got the message. I personally put 5 rounds into a 100 lb charging VC and he kept coming at me until my partner who was carrying a 12ga blasted him with 00 shot. From that day on I carried a AK-47 instead on a M-16.
I'l admit I didn't watch any of the video's above. But the major complaint was jamming (mostly due to poorly made ammo) and how many parts you could lose in the field. And you better keep it clean otherwise it was a 16lb club.