What's my AMT 25/22 worth?

[PD3341]

I picked this gun up several years ago in an estate sale and have left it in the safe ever since. I've done a little research about the gun, but am intrested in selling it soon and wanted help with a fair value. I have never shot the gun, however it is obvious the pervious owner did. It function checks perfectly and appears to be in great shape. It came with a cheap ATI stock and I placed it in the angel stock just for fun. Please let me know a little history and what you think about a fair value.