That's the kind of corrosion typical of storing a Luger in a holster in a humid environment.
Do you draw back the toggles / receiver slightly before trying to disengage the take down bolt's lever? The receiver/cannon has to be pulled back first.
Try and determine where the take down lever / side plate has excessive friction. There is also a small retention spring just below the takedown bolt that might be incorrectly installed (it has a small curve milled out of it to allow the takedown lever to function).
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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