The shape of it resembles the shotgun.
The Air Propulsion Gun is a pressurized air cannon. It sends anything it's shot at flying into the air. Although it runs on air, it still has an ammunition capacity. This is most likely because it does not have the means to pressurize the air for it to work. The only way to refill ammunition is to buy the gun again at the Black Market. However, running empty is hard as the gun has a total of 600 "bullets", but it takes about 20 "bullets" to make an average car fly. As with all Downloadable content weapons, it comes fully upgraded. This can be used for Stunts, a very difficult use in combat, or just simply for messing around. Anyone will always be sent a good few feet away depending on direction of the air pressure blast and range.
The Air Propulsion Gun deals rather low damage, about 10-15 "bullets" to kill a normal enemy and about 20-30 to kill an elite soldier. The Air Propulsion Gun is really ineffective against Colonels, as the gun is unable to cause damage, even if shooting directly to the head. The only way to kill a colonel is to make the colonel fly high enough to take fall damage, which actually won't deal much damage. The Air Propulsion is meant for having fun by making cars and people fly around, without a chance to fight back. The Air Propulsion Gun has bad range (about 30 meters) so use at close range. The Air Propulsion Gun is unable to destroy most Sabotage destructible objects. The Air Propulsion Gun can make anything the same weight, or less, than a Tuk-Tuk fly with no problem, meaning that this gun was obviously meant to mess around.
To get the Air Propulsion Gun one must buy the Black Market Boom Pack for 1.99 € from the Playstation Network, Steam, or Xbox Live (160 Microsoft Points). Once the DLC is purchased and installed, the weapon must be purchased from the Black Market for $45,000, or else it is never seen in the game.
- The Air Propulsion Gun might be an allusion to the 'Thundergun' from the game Call of Duty: Zombies.