Bro. I’ve shot many thousands of rounds (in a single instance) from the M16-A2. It did not jam. Not once. The bitch will hot-fire, full auto after several mags. The problems with the A1s were from crappy, high-ash ammo from low-bid contracts to M14 powder specs used for M556 ball ammo contracts contrary to the manufacturer’s specs. This was sorted out in the 70s. But yes, not before a lot of soldiers died from the mix-up during Nam. It was not Armalite’s fault. It was the fault of hard-tarded Army contract officers not updating the ammunition contracts to M-16 spec requirements.
M16-A1s didn’t jam much during the ‘90s, at least not in my unit. I read that many modifications had been done to them before then, though.