Well, an AK (decent one) and you'll have money left over to buy a fair bunch of ammo. Mags are cheap(er).
Home defense/shooter? At those closer ranges; Get the AK...Take the larger rd./cheaper ammo & mags, and the accessories for the AK have really become very good.
Better for zombie hunting anyway. Not as finicky with ammo. easy to clean, maintain, and can be lubed with old lawnmower oil.
For corrosive ammo, pee down the barrel and reload...

I own the Saiga AK and changed the stock and handguard,,,,, at 100yds. it thumps what I aim at. I paid less than $400 for it NIB.
Here's my son with the Saiga.


Zombie slaying approved...