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If you don't have Kroil, Mix 50-50 ATF and acetone.
Those are both great things to try first.
I don't suggest the better stuff to use on antique guns owned by a museum, because they usually want to retain whatever the surface finish is on the metal.
However, if one really has to get rusted parts loose and one doesn't mind that it may screw up the patina, then it is time to use PB Blaster. I keep a can of it around to work on really rusted repro guns.
https://www.acehardware.com/departm...m_term=4581664954601383&utm_content=Catch All
Gus