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Double Tap is a second tier perk in Call of Duty 4: Modern Warfare and Call of Duty: World at War that decreases the delay between bullets by one third of the original delay. It has no practical effect on most semi-automatic weapons to players who do not have an incredibly fast trigger finger (such as the SVT-40, G3, or M14). Some slower firing weapons such as the M1 Garand and the M1014 may benefit noticeably from this perk. This perk does not double the rate of fire as the name implies. It increases it only by a third of it. This perk is most effective on weapons that rely more on ROF than individual bullet damage, as well as close quarters weapons, but it has the disadvantage of emptying a weapon's magazine quickly and increasing recoil. It cannot be reasonably used to increase the rate of fire of semi-automatic weapons as the possible rate of fire without Double Tap is already faster than almost all players are physically capable of firing. However if the player is physically capable of doing so it may be beneficial. It makes the W1200 much more effective, increasing the pumping speed, and a hip-fired submachine gun a serious close-range threat. Double Tap is tied perfectly with Stopping Power in terms of how fast an automatic weapon kills for guns that do 30 damage. Stopping Power wins out by hundredths of a second for automatic weapons that do more, and Double Tap wins by hundredths of a second for automatic weapons that do less. This perk does have significant drawbacks, however, as it makes inaccurate and high rate of fire weapons hard to use at medium to long ranges. Effective hip-firing may require the Steady Aim perk. It also increases ammunition consumption, which generally necessitates the use of the Bandolier Perk.
Contrary to popular belief, Double Tap does have an effect on the M16A4, as it increases the rate of fire of each individual burst, but it does not decrease the 0.2 second delay between bursts.
Double Tap also affects the M1014. While it is indeed a semi-automatic weapon, there is a noticeable delay in how quickly each shot can be fired since it has a Rate of Fire of a mere 300RPM. Double Tap shortens this delay, allowing the M1014 to be fired considerably faster. However, the M1014 only has a capacity of four shells, and the magazine will be exhausted in less than half a second if fired as quickly as other semi-automatics. It also effects the Winchester Model 1200 as it will lessen the time to pump the gun. This is true for the M1897 Trenchgun as well.
Due to the 1.4 Patch for consoles, all semi-automatic weapons (Except the M1014) in Call of Duty 4 had their fire rate ceiling capped at 444 RPM. Double Tap gives leniency to the fire rate cap and allows firing at a rate somewhere between 600 and 800 RPM.
