I just experienced the same thing with my A-Bolt. I had it stored in a gun case at my in-laws. It was laying under a bed in their basement for the last two years and when I picked it up Saturday night the barrel had light pitting. I wiped it down with some Rem Oil which cleaned it up nicely but I want to prevent this from happening again in the future.
Is G-96 considered the best rust preventative on the market?