I just saw a post on calguns about a recall on "Red Army Standard" ammo by a store called "Big5". The notice is related to the the box stating that the ammo is non-corrosive while they actually are very corrosive. The person making the post said their whole rifle was covered in rust. I shot 40 rounds of it on Sunday while doing videos and didn't get to clean the rifle right away so immediately took off for the shop to see if I had any damage. Luckily it wasn't the last type of ammo I shot so the bore looked good.
I had just given the gun a thorough cleaning prior to this shoot so I know all of this is from Sunday, roughly 32 hours ago.
Luckily my gas block is stainless steel and I didn't find rust anywhere else.