Found this in a civil war / plantation field. It may be a gun part but not sure yet. It is made of brass and looks like it had a pin or something that is broken off on the round part. Also it has "cut marks" on it from when it was made. Also you can see a plow has bent it as well. Also in the picture are a bullet and a piece of very thin piece of copper all crinkled up. Let me know what you think.