#1 Glock.
#2 Big knife.
The Glock is one of the most torture tested handguns known to man. Most other companies imitated its design. Add a 22LR conversion and a 9mm conversion for my .40 SW and I have a three caliber handgun that shoots 2/3 most used LE ammo's and can varmint with super cheap ammo.
And a knife... never runs out of ammo, multi tasks and can be worn on belt, concealed, is quiet, can be lashed to a pole to make a hunting spear, can fashion other weapons, prepare food, clear brush, make fire...