I have shot surplus through my 2 sks's usually cleaning it that night or the next day and never had any rust.
Was out in the bush for 3 days and was shooting a bit, and for 3 days I didn't clean them they were also in the rain. Got home and took them apart, all looked good until I got to the gas system, Rust in the tube and around the piston. So 3 days is the most I would leave my sks before cleaning it after using surplus.
Was out in the bush for 3 days and was shooting a bit, and for 3 days I didn't clean them they were also in the rain. Got home and took them apart, all looked good until I got to the gas system, Rust in the tube and around the piston. So 3 days is the most I would leave my sks before cleaning it after using surplus.



















































