The Jackhammer is a prototype automatic shotgun with a quick reload time, that fires multiple pellets with every shot creating a large fire-area, about the size to kill two men with a carefully aimed shot. It holds 12 shells per cylinder in both games, unlike its real life counterpart, which holds 10.
Jackhammer is the ultimate shotgun; its automatic fire makes can clear out crowds in seconds. Lone enemies stand no chance against it. However, like the Spas-12, it has poor range, so it cannot be used for long ranged attacks.
Jackhammer is not equipped by any enemy, except a guard in Get Priboi. However, its ammo is shared with Spas-12, allowing the players to use it without lack of ammo since usually Spas-12 is also found in the level in which Jackhammer is found.
Just like in Project IGI, Jackhammer remains most powerful and effective shotgun. However, its ammo is no longer shared with any other weapon. It is suitable for non-stealthy approaches due to its lack of silencer. It is only found in the Libyan missions. It is not equipped by any regular guard but is used by Major Zaleb and Jach Priboi in the Zaleb's Stronghold and Prison Escape, respectively.
- Get Priboi: Found on a guard in the large warehouse in first compound
- Defend Priboi: Equipped by Priboi, though killing him will fail the mission
- Nuclear Infiltration: Found in an underground room
- Finding the bomb: Found in a room before the room with sentry gun control
IGI 2: Covert Strike:
- Prison Escape: Equipped by Priboi, though the mission will fail if he dies
- Priboi's Villa: Found in the room with security camera control outside the villa and in the room having Priboi's computer (2nd objective)
- The Airfield: Found in Priboi's warehouse
- Zaleb's Stronghold: Equipped by Major Zaleb
- When trading between the Jackhammer and another weapon in IGI 2, it is referred to as "Jack Hammer".