Firstly introduced in 1996, PP-19 Bizon is a Russian SMG fed with 64 rounds of 9mm Parabellum. It has a very high magazine capacity and able to deal with multiple hostiles. However, the damage is relatively low. Mirage (de_mirage) is a bomb defuse map. There is a detection of Terrorist's activities in the Middle East.
If you play Counter-Strike: Global Offensive, you shall know PP-19 Bizon and Mirage. PP Bizon is a good SMG gun and Mirage is one of best competitive maps in CSGO
I wonder if Mirage is still balanced in a game with many fiction guns like CSO :)