One of the things that is absolutely clear is that a sharp corner on the front edge of the bolt impacts the ball waiting to fall into the breach next and cracks it. For identification we call this the "ball waiting". The damaged ball will sometimes, but not all the time, blow up down the barrel.
I'm Trying to visualize what exactly is goin' on here. I've got my bolt, body and barrel in my hands right now, and I 'still can't seem to understand how exactly this is happening.
Will someone explain, very exactly, how this happens? Diagrams/pictures from mspaint would be awesome.

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