MIKE14,
I checked on the spring question and there are two springs, one for the solid stock and one for the collapsing stock.
After reading your question though, if you swapped the collapsing stock out, then you swapped the buffer tube as well. If you did that, I don't think that you put the collapsing stock spring in the solid stock buffer tube with the solid stock buffer. If you did, you need to make sure the solid stock spring is in there, not the collapsing stock spring.
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