Grease Gun

The Grease Gun is a submachine gun rarely seen in the Call of Duty series.

Call of Duty: Finest Hour
The M3 Grease Gun is featured in one mission only, in the mission the player takes control of Sergeant Sam Rivers in an American Sherman Tank. While on foot the player receives an M3. The Grease Gun has a slightly larger sight than the Call of Duty 2 model and has a faster firing rate. However it lacks in power, but overall a good choice of weaponry for the mission.

Call of Duty 2
In Call of Duty 2, the Grease Gun is a copy of the Thompson from Call of Duty with a few differences. It has 32 rounds in its magazine, very manageable recoil, good damage, and good accuracy. However, it has a very low rate of fire, making it harder to effectively use it in close quarters, especially when up against a faster weapon. Its sights are also very small (just a tiny triangle-shaped pin at the gun's front), making it difficult to get accurate shots. Nonetheless, it's a solid weapon which users of the Call of Duty  Thompson might prefer over the Call of Duty 2 Thompson, or for those looking for a change.

Call of Duty: World At War
The Grease Gun was going to be in the final release, but it was dropped. It still sits in the game files, and can be accessed via modding. It uses the same model from Call of Duty 2.