[DBrow]

Mossberg 590 with bayonet lug (and bayonet). Plus small .22 semiauto handgun, like S&W 422, and then something with a 4 in it, revolver or semi. Then any bolt action .22lr, and maybe some cheap bolt action centerfire, maybe in .223.

Stick to ammo that the military uses or is cheap and plentiful.

[IncPen]

ping

[Stonewall Jackson]

If I had to chose just one firearm, I'd take a .22 rifle. They are lightweight, fairly accurate, have adequate takedown power if you put your shots in the right place, and you can carry quite a bit of ammo without overburdening yourself.

But if I had the option of having five, I'd take: a 12-gauge shotgun (pump or semi-auto, whichever you prefer), a .22 handgun (a Ruger Mark II target pistol is inexpensive, accurate, and reliable), a 1911A1 (that .45ACP makes really big holes), a .22 rifle (any semi-auto would do fine), and an SKS (preferably a Russian-built).

If you shop around, all five of these firearms can be found for under $1500. Ammo for all of them is relatively inexpensive and can be found at just about any sporting goods store, gun shop, or department store (plus a number of gas stations in certain parts of the country).