Revolver

A Revolver is a type of repeating firearm that uses a rotary cylinder to store ammunition. There are two types of revolvers: single-action, where the hammer must be pulled back manually after every shot, and double-action where each pull of the trigger pulls back the hammer and cycles the cylinder.

Revolvers in Call of Duty
In total, six revolvers have appeared in the Call of Dutyseries. The following are brief overviews of each one.

Webley Mk IV
The Webley Mk IV is a British double-action revolver that appears in Call of Duty: United Offensive, Call of Duty 2, and Call of Duty: World at War (DS). It is a versatile and effective sidearm.

.357 Magnum
The .357 Magnum is unique to the Call of Duty: World at War multiplayer and is never seen during the campaign. It deals the most damage out of all handguns available in multiplayer and usually kills in two shots to the chest. It is also found in Zombies, and is a one-hit kill until Round 7-10.

.44 Magnum
The .44 Magnum appears in both Call of Duty: Modern Warfare 2 and Call of Duty: Modern Warfare 3. In Modern Warfare 2, the .44 Magnum is not available to the player in the Campaign (excluding Museum), only seen as the signature weapon of General Shepherd. The .44 Magnum also appears in multiplayer and is unlocked at level 26. It is a powerful and accurate sidearm.

Python
The Python appears only in Call of Duty: Black Ops and appears to be Alex Mason's favored sidearm, appearing in "Executive Order ", "SOG", "Victor Charlie." The Python also appears in multiplayer and is unlocked at level 18. It deals the most damage of all Handguns, but has high visual recoil, only has 6 shots in the cylinder, and has a slow reload.

It appears in Zombies out of the Mystery Box. It is powerful, but has a slow reload and low capacity. It is a one-hit kill until Round 9.

MP412
The MP412 is a Russian double-action revolver that appears in Call of Duty: Modern Warfare 3. It is usually seen on Russian soldiers in last stand.

Executioner
The Executioner (formerly known as the Raging Judge) is a revolver that appears in Call of Duty: Black Ops II. However, unlike any other weapon in the series, the Executioner fires 28-gauge shotgun shells rather than conventional ammunition.