The MP9 is a popular SMG in the game Counter-Strike: Global Offensive. This weapon is unlocked at level 1. It can be equipped with a silencer, which decreases the noise made by the gun and reduces recoil. The airlock pattern was painted on this weapon. Exchange your Soul Gems for the MP9 Airlock. MP9 | Airlock is a skin for the MP9, Counter-Strike: Global Offensive's machine pistol. The weapon has an air valve on his barrel that allows him to shoot at a low cost of fire, but with recoil compensated by the valve. The skin was designed using the template of the space station's internal door, which is why it has an airlock. Exchange your Soul Gems for this MP9!