Also consider the use of a preserving spray oil like RemOil in the aerosol.
I'm not sure that a high viscosity lubricant (synthetic or not) would work very well.
The Luger action is pretty finely balanced. Something that added drag to the motion could affect timing.
Of course, the effect could also be negligible...
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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