I'm now 49/50 on this game.
I thought the Survival 500 was awful but this just sucks. Why am I being made to buy shitty tier 4 shotguns that I'll never use?
I'm finding blitzing through 1-2 is working well for me. Less chance of dying, end up with 20k or so. Not great but doable in under 10 mins.
3-3 takes a bit too long for my liking but I might give it another go.
I wonder where this game will end up on TrueAchievements. I'm guessing somewhere around 2600TA.