Without getting into great detail in an engineering level, the AR-15/M-16 does has many flaws. There are two great flaws with this system: 1st, the magazine was never meant to be extremely strong but as a lightweight disposable item. Our American-military mindset is that is not part of the rifle and can be abused. Other countries recognize that the mag is extremely important and they make them very strong with good steel. The 2nd point is that the rifle shoots like a target rifle with high tolerances. The M-16 needs to be cleaned and well lubed with quality oils. There are many other points that I will not mention. The sights are overly complicated and require many hours of instruction to fully understand them
