From WikiGTA - The Complete Grand Theft Auto Walkthrough
|GTA San Andreas
Grand Theft Auto IV
The Desert Eagle, or combat pistol in GTA IV, is the most powerful pistol in GTA and is only available in GTA San Andreas. The weapon can do a lot of damage, but it has only 7 rounds in its magazine and it can't reload as fast as other pistols.
You reach the 'gangster level' at 20% weapon skill, and 'hitman level' at 100%.