Earth-Shattering ka-Boom! How (and Why) Guns Explode

Just yesterday Scott at Kentucky Ballistics posted a very sobering video detailing his Serbu RN-50 quite literally exploding in his face. A lot of people have asked if I have seen it, and I figured this is a good opportunity to discuss the different ways in which guns can explode, and what some manufacturers have historically done to fail-safe their designs.