Hi,
Judging from the photo the lever sticks out quite a bit on one side of the pistol. I guess that either the lever or the small lever spring is damaged, which allows the lever to move too far to one side, thus blocking normal operation.
With the gun dismantled, you can pull out the takedown lever, when it's in downwards position. Examine the lever and the little L-shaped spring.
Perhaps someone installed a home-made spring...
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