It would be my Glock 23 gen 3. This gun has proven itself with thousands of rounds shot .Who knows what the future holds, but for legal, economic and/or other reasons, if things became so desperate that you had to go down to one gun, what would it be and why? Whatever you choose (pistol, rifle, shotgun etc.), it has to be from your current inventory. If you want to also add a gun you don't currently own but you'd like for that situation, certainly mention that as well.