Double check the takedown lever spring to be sure it has the right amount of bend. If it's too strongly arched, and the edges of the groove on the lever are too sharp it can be hard to dislodge.
Make sure that you have drawn the receiver back on the frame a bit (even lock it with the magazine hold open).
Check to see the inner edge of the takedown bolt to see how sharp it is. Perhaps there is something interfering with movement.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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