Health System, Call of Duty Wiki

As with most first person shooter games, the player has a health system in the Call of Duty series. The Damage Multiplier mechanic plays hand-in-hand with the health system. Some weapons are an instant kill, namely headshots from higher-powered weapons, shotgun blasts within a certain range, most killstreak weapons, explosives within the lethal blast radius, rocket launchers/grenade launchers in the lethal blast radius, the Knife, most melee attacks, some special weapons, like the Crossbow, Ball

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