I'm going to say "None," but hear me out on this.
Guns are useful. Guns are neat. I like guns. I own guns. But I don't think they have a place in a kit like this, for a variety of reasons:
- They are expensive, and everything in this series of posts is obtainable by the average citizen. The priciest part of this kit was the bag itself, with the kukri a close second. This is why you also won't see neat-but-costly things like GPS transcievers or satellite phones. If you can afford these things, more power to you. I won't tell you that you're wrong for having them.
- Guns require ammunition. Ammunition runs out. A gun without ammunition is pretty worthless.
- Ammunition, and most guns, are heavy. A rifle or shotgun is heavy and awkward, and yes, I've humped an 80 lb. rucksack with an M-16 for miles as part of my ROTC experience, so I know of which I speak.
- Guns often draw the wrong sort of attention. I once got fired from a job for mentioning the fact that I'd rather be home cleaning my guns. In an emergency, people will be hysterical and the police overworked. I'm not giving anyone a reason to detain, arrest, or shoot me.
- Perhaps most importantly, if I want to have this bag with me on a regular basis when I leave the house (and an emergency kit left at home is rather useless when you're not at home), I can't have a gun in it. I'm a bit vague on Florida's concealed carry laws here and I don't want to experience them firsthand. There are also the considerations that A) a Concealed Carry pistol belongs in a holster, not an oversized purse, and B) if said pack ever got stolen, there's all kinds of legal trouble involved if my now-stolen gun is used to commit a crime.
All that said, if I were to suggest a pistol, I am rather fond of the Smith & Wesson .40 M&P: Single stack, which is good for my tiny hands; 15 rounds; beefy caliber which nearly guarantees a knockdown.