"Killing players, capturing objectives and holding objectives will increase your health regeneration rate."
Create-A-Class description

Quick Fix is a Tier 1 perk in Call of Duty: Modern Warfare. It reduces the user's health regeneration delay by 3 seconds each time they scores a kill, and doubles health regeneration rate whenever the user are carrying, capturing, or holding an objective. It is unlocked at level 42.

Quick Fix greatly helps aggressive and objective-oriented players to stay alive longer.

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