what is this gun?

[Jim Shane]

Responses to the replies to date:

I will upload the color pictures, thank you. I went with b&w for resolution at the small size.
I have the magazine base but it was photo # 11 and the first pass I was allowed only 10. I will exchange it for one of the 10 in the color batch.
I will also disassemble the gun to get photos of internal parts.

My father-in-law is deceased but he did give me a document with the gun that authorized him to bring the gun home. Right now I cannot locate this document and I am afraid I may have lost it. I will continue to look for it.

Thank you for any help.

Jim Shane