Corrosion begins the moment you've fired the first round of corrosive ammo. The rate varies depending on humidity AND which particular type of ammo you are using. Some is a lot more corrosive than others. Chrome lined bore helps slow it down, but the gas system still gets it.
Best tip I had regarding the issue: At the end of your session, fire a few non-corrosive rounds through the rifle. That blows a large portion of the corrosive salts out, and will usually reduce the amount of effort required in cleaning. Some claim to not bother doing a "corrosive" cleaning after using this method. I'm not that brave.
Best tip I had regarding the issue: At the end of your session, fire a few non-corrosive rounds through the rifle. That blows a large portion of the corrosive salts out, and will usually reduce the amount of effort required in cleaning. Some claim to not bother doing a "corrosive" cleaning after using this method. I'm not that brave.



















































