You have pretty much all the bases you need covered, minus the 22 pistol on your list. If money is an issue (and it is, for the vast majority of us), I would suggest you limit your calibers, at least for your "primary prep guns". Do you CCW? Which gun do you carry most? Looking at what you have, I have a few suggestions. Sell the Glock 21 and buy a Glock 19 or 17. This will allow mag interchangability with your two G26s, and more importantly, ammo interchangability. 45ACP ammo is significantly more expensive then 9mm. Consider a 22 conversion kit for your Glock, this will allow you to practice with what you carry, and have the flexability of having a 22 pistol platform. Consider a 22 revolver, because a revolver will be able to fire any 22lr round, without having to worry about cycling. 380 ammo is expensive, evaluate your need for the Bersa. If its the CC model, that would make more sense then the full sized because it would fill a role if you CCW it. Your AR-15 is going to be your primary long gun if SHTF, stock ammo, mags, and parts accordingly. Your double barrel is fine, don't be so quick to feel a need to replace it with a tactical shotgun. Most likely, in a SHTF scenario, your AR-15 will be better suited anyway. The double barrel will be great for hunting and gathering, and can serve as a self defense gun in a pinch. If you are considering using your pool as drinking water, just be mindful of the levels of chlorine, and test it before assuming its safe to drink (common sense). Keep prepping!