A glock 22 with as many mags and rounds as I could find. You cant beat the reliablity and durability of a glock. They can shoot the nastiest of rounds and keep on trucking. Ive put 5000 rounds through mine and only misfed once in the academy due to a faulty reload. The second would be a ruger 10-22 with a fully automatic kit installed along with as many 50 round mags as I could find. The rounds are cheap, light, and you can put 10,000 rounds on you easily. The 22 lr is not an armor piercing round but in the event of social upheaval, your not going to be fighting the government, you will be fighting your neighbor for your groceries. A 22 lr is very deadly when aimed properly. No recoil makes for better accuracy. Give me ten rounds of 22 lr and I will give you 10 7.62's. On full auto I guarantee that I will hit you ten out of ten with a 22 lr but the ak will be all over the place.