Originally Posted by nitestalker
The rifle barrel is acting as a condensation devise. The problem is the fluctuating temperature in your gun safe. The moisture forms and remains in contact points where the barrel rest. You need a small electric dehumidifier. The problem is the condensate collecting and evaporating in the bore of the barrels. A product called "Ballistol" works well in these conditions.
Agree! Good clarification. Those small heaters ought to keep the inside and whatever is inside, at a steady warm temperature.