Why do people feel the need to completely disassemble a firearm after each use? Do you suppose they disassemble their vehicle's engine every 5000 miles, also? From reading forums, I've noticed a lot more firearms have been damaged by over zealous attempts to "clean" them than from actually shooting.
I push a couple of patches through the bore now and then but I can't remember when I've torn a gas system apart. The main reason I may do a complete tear down(other than corrosive ammo) is getting a rifle soaked while hunting. The only rifle I've seen actually rust was taken out in a snowstorm and then brought inside but not thoroughly dried before going into the case for transport home.