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Originally Posted by tipoc
Simple thing. The magazine tapers sharply towards the top. The spring must be sized to accommodate this. So one coil can be come caught in the next larger one. The right angle kink only appears when when released from the mag. But notice in the vid that it's caught up inside the mag when he has to pull it out of the mag towards the end of the video.
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Don't think that really explains what we can see...
I don't think most magazine springs have a taper, (either in shape or metal diameter) which is what you seem to describe. Most of them stay in contact with the sides of the magazine throughout their travel.
If the spring has a defect in the metal and that portion of the spring FAILS while in the magazine, the steel in that area can bend and twist in very unpredictable ways. But because the spring is somethat constrained by the stronger metal case of the mag tube, it can still move around, but is now free to mave in ways the mag tube can't control.
I think the spring twisted and/or kinked due to metal failure, and somewhat knotted itself up inside the mag tube.
- That knotting and twisting caused the spring to also push against the sides of the tube rather than just the top and bottom, and that in turn caused the follower to be stuck partway down the mag tube -- it sort of expanded (twisted/knotted) and plugged things up and held the follower in an unexpected position. It couldn't do anything else.
When the spring and follower were pulled out of the tube, the spring finally had room to expand farther (from its already screwed up but constrained by the mag tube-shape), and that gave the results we see in the image.