Your location summary is correct and at the very same time incorrect.
I now live in Arizona and you are correct, most of the year the outside humidity is minimal. That is unless you have swamp cooling. For those of you that don't know about swamp cooling. This is where water is dribbled over pads and air is sucked through them, evaporation cools the air, about 20 degrees, the wet cooled air is ducted into your house with a very big fan. Relative humidity is very high in your house.
You are also discounting life experience. I lived for the first 24 years of my life in upstate New York. Humidity and condensation are/was always a factor to deal with. Then factor in the fact that my father owned a gunshop with a range in the back yard. We shot a lot more than the average gun owner. Excluding black powder guns and old military ammunition we almost never cleaned. Sure we wiped down the gun after a rain and ran a patch through the bore to remove water and condensation, but that is not cleaning in the way you fellas are talking about. I hate to break it to you guys that swear to a heavy cleaning regiment, we shot hundreds of firearms and never had rust and I do mean never.
There was a time when constant cleaning was important. Primers were the usual culprit in ammunition manufactured before the 1950's (Military primers, especially match grade primers were a problem up into the mid or late 1950's). These mercury primers created a salt that drew moisture if it was not cleaned. Before that it is well known that black powder was extremely hard on firearms and cleaning was absolutely necessary.
Modern day powder and primers do not have a tendency to draw moisture. As a matter of fact I believe that the carbon and graphit left behind after shooting will coat your barrel and to a degree protect it from rusting. I believe in a dry barrel. For many years I've heard about military (Army and Navy) and other tests that prove that oil is one of the very worst rust preventers. Seems wrong doesn't it. They say that water lives very nicely UNDER a nice coating of oil, with the oil even preventing the water from evaporating. I can not swear to the validity of these verbal reports, but I absolutely believe they are correct.
Lets look at shotgun barrels. I have no trouble believing that more shotguns are put away and never cleaned than any other firearm. It is also my belief that many shotguns are shot thousands of times more than the average rifle. I do see some rust, but very little. Most rust is on the outside where uncleaned oily hand prints leave nasty marks.
I love the very predictable remark about proper cleaning and barrel life. It is true that a chamber or barrel crown guide is necessary to reduced inappropriate barrel wear. I have many of them, the cheap ones went into the trash, the ones I use are chamber and bore specific. Believe it or not I clean some of my rifles frequently. My PD and other relatively long range rifles, including my M1 garand, get plenty of cleaning. But they are shot alot and this cleaning is to restore accuracy and remove copper fouling.
If you want to see some real sport with those that believe in a constant cleaning regiment? I like to ask about what cleaning rod material they prefer. Brass, aluminum, stainless steel, hard steel or hard steel with some sort of coating. Better yet state that your choice is an absolute with little room for variation.
I am an absolute believer in a hard steel coated rod. I like shooters choice and I use sweets 7.62. I wipe down between the two with laquer thinner. Ending with a wipe down with Kroil, I let it sit for a short time then patch dry and put the gun away.
THis is all great fun and can be educational. Now feel free to jump in and tell me how wrong I am. /ubbthreads/images/graemlins/smile.gif Common my fellow shooting brothers, lets play.