Geez - people are getting all defensive about their beloved ARs. The AR is a GREAT rifle, but this wasn't an issue of "which is a better rifle?", it was purely a question of reliability.
Unfortunately, despite those of you that think the AR is perfect in every way, it is only as reliable as an AK when it is kept clean and fed good ammo. On a range, with time to clean every couple of hundred rounds, of course an AR can be as reliable as an AK. Under those conditions, ANY well-built semi-automatic rifle should function flawlessly.
Under more rugged and "combat" conditions, there is unfortunately no doubt that IN GENERAL, the AK system is more reliable than the AR system.
The fact that someone knows someone who once shot 4000 rounds through an AR without a failure, and someone else once saw someone at the range with a cheap egyptian AK clone that jammed on every round has nothing to do with anything.
The fact that a lot of countries chose the AR also does not have to mean too much. Look at where they get it. The Galil (and Glion) is generally a better rifle, but whenyou can get ARs for free from the US, why would you pay to build your own? Lots of US allies choose the AR because they get big discounts, or because they have decided to go with the 5.56, and the AR is a lot cheaper than other alternatives.
Saying that it must be the best, because all of the US armed forces use it is also somewhat narrowminded. I suppose that means that if the AK really was better during the Cold War, the US would just have ordered millions of them from the Kremlin to equip the US military? yeah right. If the FAMAS were better do you really think the US would equip its military with a FRENCH rifle? God forbid! It had to be US made, but that does not mean it could not have been better. A better gas piston system, for instance, could probably improve reliability quite a bit.
Just my $.02 - I don't really like 5.56 anyway. Let's debate 5.56 vs. 7.62 instead