Just find a good cheap throw away gun & swap it out every 3 to 6 months or so.
"Why a De Lorean of course". Nice........ The gun that is least likely to rust is the gun that is carefully maintained with a thin layer of oil on it. If you don't keep it oiled - it WILL rust. Leaving it unattended is the issue - not the steel.
They use oil because it lasts much longer.
Here's a pic of a Colt Stainless frame that someone left the rubber grips on way too long before looking. As mentioned so much for stainless being rust proof. IMHO, a Glock would come close to be the one you can store away and forget but not totally of course.
"I haven’t kept a gun coated in oil since the late ‘60’s and haven’t had any rust. Buy a can of Johnson’s paste wax and wax them. Of course I use oil on the insides." Having been stationed in New Mexico (assuming you have been there since the 60s) I kind of think your climate has considerably more to do with your guns not rusting than using Johnson's Paste Wax. Besides, in a desert environment paste wax will evaporate away in short order. I have never seen any manufacturers that shipped new firearms coated with Johnson's Paste Wax. They use oil because it lasts much longer.
I have no comment on your wax vs oil argument, but while you may not live in a desert, but relative to some place that may be on a the coast, or has weather extremes you are probably as close to a "rust free paradise" as any place in the US.By the way, NM isn't all desert. My area certainly qualified last year but it isn't always as dry as last year.
... while western and southern New Mexico exhibit a warmer, arid climate.
I have no comment on your wax vs oil argument, but while you may not live in a desert, but relative to some place that may be on a the coast, or has weather extremes you are probably as close to a "rust free paradise" as any place in the US.
https://en.wikipedia.org/wiki/New_Mexico
Pensacola has a humid subtropical climate