Grease Gun

The M3 "Grease Gun" submachine 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 CoD1 Thompson might prefer over the CoD2 Thompson, or for those looking for a change. It was shown with an inaccurate iron sight with the "V-notch" sight, not the standard peep sight.

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. A low-rate of fire weapon, not one of choice, but good accuracy. Also notice that it looks more like rusting off the steel plate. It was once again shown with the inaccurate "V-notch" sight from Call of Duty 2. It may have been replaced by the Thopson for an American SMG.