Keep in mind this is JUST MY OPINION but if its for SHTF and not just for fun, then stay away from the ruger charger (hurts me inside to bad mouth anything ruger for any reason) and that kel tec. I understand your want for light/mobile/compact weaponry, but DO NOT settle for a 8-12 inch barrel in a weapon who's primary purpose is small game hunting. Keep in mind that a squirrel is a pretty tiny target at 100 yards for a small caliber rifle, and you want every inch of barrel you can muster to reach out and touch it.
Remington Model SPR94™ Shotgun/Rifle Combo Specifications
- a LITTLE bulkier than what you want, but man is it a good survival rifle! the ability to fire either .22 or .410 is unbelievably important in a survival situation. You know how hard it is to hit a bird with a .22?
If you really cant afford the space that would take up or what have you, the marlin papoose is a great option.
good luck with your search man