I always have to wonder what the point is in threads like this.
Not that I disagree with posting the subject, but it seems to me like there's likely more point to it than simply posting your favorite firearm.
I spent a lot of years buying, trying, selling, and trading firearms to finally get what truly works for me and my uses. One's not better, or more important than another; they're simply suited for either specific or general purposes, each to their own purpose.
Giving up one would mean making due with something else to "make due" for not having the right tool. Like making due with a screwdriver for a pry-bar, or a pipe wrench or pair of pliars for a hammer.
So, if I had to give up all of the tools in my shop except 1, I'd probably keep a medium set of Vice Grips. It's not really the right tool for anything, but it can be used in a pinch for a lot of things.
I see my firearms the same way. If I gave them all up for one, that one likely wouldn't be my favorite. It wouldn't be well suited to many things I do, but I could "make due" with it.
I'd probably end up buying something like a .270 or 30-06. It's entirely too big for foxes and bobcats, too big for coyotes, still on the large size even for the deer around here, and maybe on the ligher side for larger animals at longer ranges. It wouldn't fit perfectly into much of the hunting and shooting I do, but I could "make due" with it if I had to.
And all of the years and effort I put into finding the right tools for the types of hunting and shooting I do would be for naught.
Which is something I just can't do.
Daryl