You can only take one on the ark w/ 12 rounds of ammunition? I'll take my beloved Springfield Armory M-1 Garand (5.9 Million) produced in 1956 and rebuilt at Letterkenny Army Depot (LEAD) in 1966. I would carry some nice M-2 AP (Armor Piercing) w/ four in the rifle in a short enbloc clip and the other eight in a standard clip. Why? Well, guess there would be very little on that ark that M-2 AP could not calm down. And for the times of boredom, etc., I could spread a blanket and enjoy taking it apart and then putting it back together! Sincerely. bruce.