Of course, considering the US Army ordnance board deliberately sabotaged the rifle in a desperate attempt to save the M14.
http://anarchangel.########.ca/2007/02/whos-at-fault-for-m16.html
Aye and it failed for other reasons because it was rushed into service to get it into the jungles of Vietnam. It had to be. The project to replace the M14 with the AR15 was well under way. Production of the M14 had stopped to make way for the new AR design to become A1. Then Vietnam fired up. There weren't even enough M14's to arm half the soldiers and the war/deployed troops was escalating fast.
Primarily 3 issues led to the initial failures:
1. No cleaning kit was issued with the rifle, very little familiarization with troops prior to sending them into firefights with it. Literally zero cleaning kits for a new rifle rushed into service directly into a war with some of the most horrid environmental conditions ever seen!
2. Chamber and bore NOT chrome lined to resist corrosion (coupled with NO CLEANING KITS in the humid soaking jungles of Asia mind you)
3. And 3 the US military chose a propellant they knew caused excessive fouling but chose it anyhow as standard for the M196 cartridge to get the cartridge and the rifle into Vietnam ASAP and not have to go back to the drawing board and leave troops without a rifle in a war.
Number 3 combined with 1 and 2 meant the "legendary M16 Vietnam failures" were caused 99% by badly corroded chambers. Soldiers would chamber a round, fire it, failure to extract case and almost impossible to get the case out. Prior to the failure reports, actual performance of the rifle in Vietnam was outstanding on the contrary. Only after the chambers started corroding did the issues begin.
The issue was so scandalous it went to the highest levels of investigation and culminated in the Ichord subcommittee.
The issues were hammered out over time ie cleaning kit, chromed bores and barrels, proper training and better propellant. Other shortcomings are apparent these days primarily the lackluster terminal ballistic performance of the M855 cartridge stemming from idiotic demands about the round having to pierce an armour helmet at 400 meters etc but this too is being corrected. The newish MK318 5.56mm Cartridge is one of the very well designed solutions to the problem.
The AR15 is masterpiece of a modern firearm design. It was ahead of its time by decades when Stoner cooked it up and it's still holding its own.
I just wish to god I could actually shoot one outside of a range! lol