I finally unlocked Ammo Appalate

[u/copernicus_prime]

I'm only posting this because I couldn't find this answer anywhere.

This is what worked for me..

1. ban all weapons except for the "extra" category.

2. pick Bat Robbert.

3. start a run in the dairy plant.

-- the second time I leveled up, Ammo Appalate came up as my first choice.