Many here who have experience with these guns say they can jam before firing. So maybe you should be careful who you call a liar.
Did I say that, or did I say, "She's either a liar, or her brain didn't work." I'm intimately familiar with the gun. She had enough time and training on the range that she should have had no problem. As I mentioned before, kids can do it. I'm also familiar with USMC trials and evaluation reports on the guns.
"Many here who have experience with these guns say they can jam before firing."
When they post why, it will be meaningful; otherwise it's not.
I spent 22 years in the military and carried an M-16 for nine years, so I'm not exactly a novice.
I've seen people under stress forget to pull the charging handle, fire all the rounds without realizing they pulled the trigger, eject the magazine without realizing it, etc.
Although a weapon can misfeed when the charging handle is initially released, it is rare. I never experienced it and have fired tens of thousands of rounds through the M-16. When this happens it should be relatively easy to clear if the person has the minimum training.
I think that people are falsly blaming the M-16 when the problem was either very poor maintenance or lack of training.