SPAS-12

The Franchi SPAS-12 is a combat shotgun in Call of Duty: Modern Warfare 2 and Call of Duty: Modern Warfare: Mobilized. The SPAS-12 was designed as a Dual-mode shotgun, meaning it could be fired semi-automatically or by pump-action. While it was not very popular due to its weight and complexity, it is highly recognizable as an aesthetic weapon. The SPAS-12 was banned from US importation in the early 1990s, ceasing production in 2000 due to an overly complicated control setup. A pump-action only version was produced called the SAS-12. A newer version called the SPAS-15 was produced, also as a dual-mode shotgun but with a pistol grip and box magazine. However, it too ceased production in 2005.

Call of Duty: Modern Warfare 2
It was first seen as a pickup icon in the Cliffhanger video, and has been seen used twice in multiplayer videos; once with a silencer and once with no attachments. In multiplayer, it is the first shotgun available to the player. It is now a secondary weapon instead of a primary weapon. It's the only pump action shotgun in the game, not including the W1200, which isn't available anywhere but the museum, or the Model 1887, which is lever action rather than pump action.

Modern Warfare: Mobilized
The SPAS-12 is the Insurgence shot-gun in game. It fires semi-automatically, making it useful for large crowds of enemies in tight spaces. It can only be reloaded one round at a time.