I half detail stripped my new CD last night. I took everything out of the frame except the sear pin/sear/disconnector. Once removing the hammer, I looked in an along the inside of the frame near where the trigger bar runs it had surface rust. This is on the left side of the frame. The gun is blued. Should I be concerned about this? It doesn't seem like it would be good? I'm new to taking apart guns, but this gun is just so simple to dissasemble. Any ideas?