What causes a bolt to come apart after being fired?

[Timmer]

Was the bold disassembled prior to firing for a cleaning? Was the bold reassembled correctly? Was the firing pin broken?

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[dukeofdata]

I've had a bolt come apart at the range because of a broken extractor plunger. Another common problem is an incorrectly assembled extractor/extractor plunger.

This is how it looks assembled correctly:
[IMGW]http://i28.tinypic.com/2upqtfk.jpg[/IMGW]

[INLAND44]

I've had a bolt come apart at the range because of a broken extractor plunger. Another common problem is an incorrectly assembled extractor/extractor plunger.

This is how it looks assembled correctly:
[IMGW]http://i28.tinypic.com/2upqtfk.jpg[/IMGW]

This. Most likely incorrectly assembled. And that is an incredible picture that's worth at least a thousand words.