If you can lock the toggle back all the way up, and look at the front of the frame (under the barrel), you should be able to see if the locking block of the takedown lever is up all the way...If it is, and you have a long thin punch, and the lever is fully seated (all the way in), you could punch the takedown lever block down to the disengaged position, then drift it out of the frame like it should come out...
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