It may be worth checking to see if you can rotate the pin by cycling the action. This will help you understand if the corrosion or solidified lubricant is on the rear toggle, or the receiver ears. If you cycle the action, and the pin remains without moving, the adhesion is on the receiver ears. If it moves with the rear toggle, the adhesion is on the toggle itself.
Different models of Luger have a different amount of lip on the left side of the rear toggle pin. It is possible that the sticking is on this lip in line with the side of the receiver rather than along the axis of the pin.
If a lubricant is solidified, it might help to tap the pin and the surface it's adhered to lightly with a nylon or brass head hammer.
This is a very hard pin. My experience has been that they break before they deform.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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