The AKM is a standard weapon the High Command team uses, it is extremely overpowered, and one headshot does 100 damage. (Close range)
Some people argue that it should be nerfed or the M4A1 should be as powerful as the AKM.
History
The AKM was also before obtainable in the criminal spawn, where you'd get fake keycard and an AKM. However, this was changed and the AKM was replaced with MP5. Before that, there was screens placed around the prison with a countdown, no one knew what would happen when the time was up. You can see the moment from here.