I found it to be just dirty and not corroded and rusty even after using the nasty Chinese LC52 ammo. Don't get me wrong I plan to clean it with the stinky WW2 anti. corrosive bore cleaner after I fire this ammo in it and not cleaning. I must have gotten lucky with the way I stored it in my safe with a Goldenrod in it. My thanks to all that gave information to me on the 30 carbine ammo from China.