The new spring gave it enough force to close, but now I have two other problems:
It's really hard to chamber a round when the mag is fully loaded. The notch for the hold-open seems to hang on the rim on the top cartridge, and it takes a good yank to get the breech block beyond that point. Could be that the feed lips need to be adjusted a bit to get the cartridge to sit lower, so the next step will be to try it with an aftermarket mag and see if it works better.
It fed correctly with just a few rounds in the mag, but the firing pin failed to **** several times. Not sure what's up with that, the sear engages just fine when i work the action by hand.
Back to the drawing board again...
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