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That's just a movie thing. Without the barrel and chamber to contain and direct the force of the burning gunpowder, all you get is a loud bang. It'll scare the crap out of you, but nothing worse than that.
Where a "cookoff" can be a problem in a military situation is if a full-auto weapon, the gun itself, gets hot enough to start setting rounds off in the chamber: it's also obviously an issue with ammunition large enough for the explosion itself to be dangerous. Large amounts of small-arms ammo getting caught in a fire could, of course, reprodce this effect.
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