I just saw an interesting looking gun in the NRA's American Hunter magazine. It comes with 3 interchangeable barrels: .243 Win, .22 LR, and 20 gauge shotgun. The blurb and the accompanying photo show a synthetic stock, scope mounts and an adjustable cheekpiece. Surprisingly, there is no mention of it yet at Rossi's US website although they do list a wood-stocked version without the mounts and cheekpiece here.

All in all a pretty versatile setup. A scoped .243 for long range deer-size game, .22 LR for small game, shotloads for birds, and slugs for (admittedly last-ditch) bear defense. I could see this as a pilot's survival gun depending on the weight, and of course the quality.