There's not a whole lot you can do. The temperature differential is going to cause condensation, metal being such a good conductor and all.
For the barrel, in the good old days, we used to use Rain X type products on the inside, I know a few guys that swore by Fantastic. That might make it easier to clean out the barrel with fewer shots.
Illigitimus Non Carborundum
Originally Posted by DSA
Dude I'll be 42 next month the only movement i'll be joining is in the crapper.