The TEC 9 has a slow fire rate. It holds 50 rounds per magazine in the 3D Universe, and is commonly used by gangs. When the Hitman skill level is reached in GTA San Andreas, the TEC 9 can be dual-wielded.
The TEC 9 is a cheap open-bolt handgun manufactured in the United States between 1980 to 1994 by Intratec. It is based on the Carl-Gustav M/45 submachine gun, more commonly known as the "Swedish K". Originally it was designed as a low-cost alternative to the M/45, but never found a military market. Not wanting to abandon the idea, Intratec put semi-automatic versions onto the civilian market. It gained infamy after criminals found the open-bolt design to be easily convertible to be fully automatic.
Available in both Grand Theft Auto V and Grand Theft Auto Online, the Machine Pistol retains some the original design of the TEC 9, however it features a longer barrel, which is closely proportional to the rest of the weapon. The Machine Pistol also has some influences to the Mauser C96. The default magazine clip is also much shorter and holds 12 rounds instead of the 50 rounds from previous games.
In reality, the TEC 9 is a semi-automatic weapon, although it can be illegally converted quite easily to fire in full-auto. For this reason, it is popular amongst criminals, befitting its inclusion in the GTA games.
The TEC 9 has no recoil animation.
If players were to turn the "Pedestrians have guns" cheat in GTA: VC, the TEC 9 will be one of their main weapons along with the pistol.
In GTA: SA, the TEC 9 shares the same weapon skill as the Micro Uzi and both level up through the use of either weapon.
The TEC 9 is used by all Los Santos-based gangs in missions only, while it is only used by members of the Grove Street Families until it is replaced by the SMG when all gang tags sprayed over.