MP9 is a submachine gun with a high rate of fire. It was designed by Belgian company FN Herstal in the 70's. The Mp9 was painted with dry leaves as template which gives it its unique look. Exchange your Soul Gems for an MP9 | Dry Season. MP9 Dry Season is an exclusive weapon for Counter-Strike: Global Offensive. This machine pistol has a special feature - the silencer. It is mainly used for silent attacks. The MP9's damage is average, but its rate of fire makes it a very common weapon in the game. Exchange your Soul Gems for the MP9 Dry Season.