An american assault rifle called AR-15, which is widely used by the military, is far and away an inferior design to other, less "traditional" designs such as a weapon known as the steyr, which (I am informed by a friend who studies this religiously) superior in every way.
Mostly I just mentioned it because I hear about it from that guy so often, and it's something I can add to the discussion.
The entire American gun industry is known to be exceptionally, well, they prefer guns that fit their idea of what a gun should be like, rather than stupid shit like ballistics testing, comparative analysis, effective range, new features, or reliability.