Depends on the situation. I like both the 870 and mosin. Also a good ol'fashion marlin 30-30 is a fantastic woods gun for hunting and taking a beating. Then of course you have your MSR's which will have plenty of parts availabe for them. As far as pistol a 357 for revolver so you can be diverse in ammo (.38 or .357) or any pistol you trust and know how to use well. All the gadgets and latest gear are cool but it is your mind that must be your go to tool. People have survived with much less, so when it comes to being in the woods or survivning you should practice camping, bushcraft, snare making, fire starting and shelter building. These things are priceless as a rifle makes a horrible shleter or pillow LOL!
"A free people ought not only to be armed and disciplined but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government."