Zombie games like Days Gone

Has anyone found any post apocalyptic zombie games like Days Gone? What I'm looking for is something with guns and plenty of ammo. Everything I'm finding is primarily melee based or a survival game where you have to play for hours before you find a gun with 3 bullets. Either that or they require coop to play. Wtf is up with this genre? Is Days Gone is the only game with a single player shooter experience?

Edit: For Playstation