 Sometimes you have to bug out and you have to be careful as to which firearms you choose because of weight and the caliber choices. You have to make sure you have enough ammo, of course, and you have to keep the weight as light as it could be as well as the size of the firearms. But I'm going with the Glock 19. The main reason why is because I have many of these. Compatibility with the Glock mags and the nine millimeter round is key. I'm going with the X-DAR EP9. It's got a polymer, a lower receiver. It's polymer all throughout. It is very light, under four pounds, totally fine. With this in a bug out situation, very lightweight, which is key. Both those are nine millimeter and they both take Glock mags. Smallest version that I have and that's a Springfield Hellion. Bullpup, lightweight and shorter firearms. Those are my three firearms. I would choose.