Stealth build is also agility build, meaning he does maximum damage with cheap 9mm ammo, nearly free bow ammo, and has the most powerful handgun in the world that will blow a man's head clean off, the 44 magnum. He slices and dices.
I mean if you stealth through your POIs during the week and slit everyone's throat with a knife, you'll have loads of ammo on horde night and do just fine. I did.
Its not incredibly hard to pick up an AK here and there either and use all that 762 ammo you found on horde night. TO me the AK guy has to mine, the 9mm stealth guy sort of doesn't near as much. Maybe for his 44 ammo but if you use bows and knives mostly you should have enough 9mm for oh ♥♥♥♥ situations and hordes.