Rust and Rifling Colt 1911 (1942)

I have what I consider a beautiful original issue Colt 1911 from 1942. It was issued to my father-in-law who is now gone so I cannot get information from him. I know he was an Army CB in the Pacific and carried this weapon all those years. He retired full bird and was in reserves for a full career, including the summer camps and teaching.

Questions:
One picture shows the slide and some rust. Is there any way to retain the original finish but buff or polish those rust dings out? Do not wish to send it in for a re-do. Some might say it adds character, and I might agree.

Second picture, since I do not know how much he shot it, is it possible to shoot down some of the rifling such that the barrel does not do its full job on bullet spin? The rifling looks a little thin to me.

It's a range gun only and I put probably 50 rounds every few months through this gun and love knowing it did it's duty during the war. I want to keep it original (original springs and magazines btw) and just want to bring it back as best as possible.

I would appreciate any advice. Thank you for your time on this.

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