I would go for something that would take a 5.56 NATO - ammo would be in almost any police station, military base, gun shop, etc. May be able to find something laying on the ground with someone's hand still attached to it. I would certainly pick the 1311 as my one knife. Light enough to carry all day and big enough to do some wood choppin' - anything smaller than the 1311 I can make on the run or just hunt around for a carton knife.