Something I read a year ago sounds very pertinent to your point. For much of my life, I have heard horror stories about how the early M16s would jam. They were virtual "jam-a-matics."
For years I believed this was because the early rifles were not well built or well tested.
Then I read this article explaining that the CIA never had any problems with the weapon when they used it in Vietnam. That they never had a jamming problem with their weapons.
It turns out, that when the weapon was developed, the company specified a particularly clean burning and smokeless propellant for the ammunition. Guns equipped with the original manufactured specified ammunition did not jam. They worked flawlessly.
It turns out, the Army had a lot of left over gunpowder from World War II, and some of the Army Bureaucrats thought it would be terrible to let all that gunpowder go to waste, so they re-purposed it for M16 ammunition.
In other words, they started manufacturing M16 rounds with left over gunpowder from World War II, that was never designed to be used with the M16 rifle. It was dirtier than that specified for the M16, and it clogged up the gun.
The correct powder did not do this, and indeed, the correct powder would likely "clean" the rifle when it was fired through it.
All of our casualties from M16s jamming were the result of people trying to save money by re-purposing old gunpowder designed for other rifles.
Just thought you would like to know how our Military Bureaucrats had your best interests at heart back in the 1960s.
We are from the Government,,,