Ultra mutations:

Weapon Modder: At the start of every new area, a weapon mod spawns (so 1-1, 2-1, 3-1, etc.).

Armor Smith: When upgrading a weapon, you also gain two armor. Armor max is 2.

One With The Gun: Increased fire rate and reduced ammo cost for all weapons excluding melee (decreased melee fire rate).

Scrap Finder: Weapon drops give you health, rads, and more ammo for all types.