Breech condensation

I doubt a little bit of moister will affect the massive blast of air from the airgun or pellet trajectory. You can coat it with some Rem Oil which helps preventing rust.

Moisture would collect around the power wheel of my fx bobcat ,but then I learned the moisture was caused by the warm air from my nose everytime I exhaled.

I wouldn't worry to much about it, just make sure you dry it off and oil it down after shooting. This summer it was so hot and humid outside where I live, that if I took my gun directly outside from the house it looked like it had just rained on every hard surface on the gun. Unfortunately that meant the scope as well. I had to let the gun sit in a window with direct sunlight to "warm" up before taking it out.