You can Gunzerk while in Fight for Your Life.
Killing an enemy Instantly Reloads all of the guns that you have equipped that are not currently in your hands.
Swapping guns after Auto-Loader has reloaded a gun triggers Locked and Loaded.
Filled to the Brim
Increases your Magazine Size with all weapon types.
Also increases your Ammo Carrying Capacity with all ammo types.
Fistful of Hurt
Press [melee] to throw all your weight into a punch, causing massive damage and knocking back the enemy.
Fistful of Hurt also has a cooldown.
While Fistful of Hurt is on cooldown, [melee] will perform a regular melee attack.
No Kill Like Overkill
When you kill an enemy you gain a bonus to Gun Damage equal to the amount of excess damage you dealt to the enemy you just killed.