Killing an enemy increases Fire Rate and Critical Hit Damage with Guns for a short time.
Down Not Out
You can Gunzerk while in Fight for Your Life.
Ain't Got Time to Bleed
While Gunzerking, you Regenerate Health.
The lower your current health, the more powerful your Regeneration.
Shooting an enemy decreases Cooldown on Gunzerking.
This effect can only occur once every 3 seconds.
Your shots have a chance to not consume ammo.
The lower your health and shields, the greater the chance of free ammo.