It is interesting reading the different ways folks clean their firearms after firing corrosive ammo. Some folks will not shoot corrosive ammo period. That is good leaves more for me
. After firing corrosive ammo I have always used Hoppe's to clean with and have had no problem with rust, none. I'm not saying the way other folks clean their weapon after firing corrosive ammo is wrong or that my way is better. The way you clean your weapon works and that is all that matters.
The only weapons I do not shoot corrosive ammo in is my M-1 Garand and M-1 Carbine. I just don't want to have to strip them down to clean the gas system, From what I have read it isn't good to remove the barreled action from the stock often due to the way it locks up on the M-1 Garand, not 100% sure on that last statement it's just what I have read.
When it comes to the 1903 and 1903A3 they get all the corrosive they want