I never had my M-16A1 jam in Vietnam. There were very few malfunctions by others in my platoon. When it happen it was usually because somebody didn't do basic cleaning procedures during their down time.
I have 29 ARs and one M-16 now. I can't even remember the last time I had a malfunction with any of them. Of course I just use them at the range and clean them after every firing.
I don't use the original M-16 upper (to preserve the value of the firearm) so every few years I trade out an upper for range shooting. Sometimes I have to go through a couple of AR uppers to find one that is tuned for F-A.
On occasion over the years most of the malfunction have been attributed to under power ammo or maybe a magazine failure. Once I had to replace a weak buffer spring. Another time I had a barrel that was a little over gassed so I had to put in a heavy buffer before it
NBA Finals game ( With 4 attackersPerfect target rich parking spot for terrorist & a trunk load of 100 round mags. 50,000 beer drinking hot dog eating sitting ducks just prime targets. There will be 100's dead & 10 times more wounded & injured.
And 2 insiders who Chain & lock 3 prime exits prior to Machine Pistol & grenade festivities followed by 2 suicide vests