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A bolt buffer is a plastic or rubber block put in behind the spring at the end of the buffer tube. Pop out the buffer and spring...shine a light down the stock tube. Sometimes they're black...sometimes they're white. It's quite probable you don't have one. But not an issue anyway as you've described.
Check that the mag has the dry fire off...the nub should stick up from the mag. It pushes the arm of the bolt catch to put it into the "catch" position.
Take a file and square off the edge of the bolt that's all rounded off. It needs to be square or else the bolt will ride up and push the catch out of position.
Forget the bolt catch spring strength for the issue you're having.
If you hold the empty mag up and pull the bolt back...does the bolt catch? If so then basically the nub on the mag isn't pushing the bolt catch arm up high enough. It usually happens if there's too much slop/play in the upper and lower receivers.
A couple of fixes for that.
1. Adjust the magazine catch to raise the mag up a bit higher
2. Adjust the bolt catch arm to lower the leg part that is pushed up by the nub on the mag
3. Adjust the mag so that the nub is positioned higher when the mag is emptied
Each of those require disassembly, bending some parts and/or filing some areas.
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