How a Intratec TEC-9 works

The Intratec TEC-9, TEC-DC9, or AB-10 is a blowback-operated semi-automatic pistol. It was designed by Intratec, an American offshoot of Interdynamic AB. The TEC-9 was made of inexpensive molded polymers and a mixture of stamped and milled steel parts. The simple design of the gun made it easy to repair and modify. Swedish company Interdynamic AB of Stockholm designed the Interdynamic MP-9 9mm submachine gun. Interdynamic intended it as an inexpensive submachine gun based on the Carl Gustav M/45 for military applications, but did not find a government buyer, so it was taken to the U.S. market as an open-bolt semi-automatic KG-9 pistol. The open-bolt design was too easy to convert to full-auto. Because of this, the ATF forced Interdynamic to redesign it into a closed-bolt system, which was harder to convert to full-auto. This variant was called the KG-99. It made frequent appearances on Miami Vice, where it was legally converted to full-auto by Title II manufacturers. The KG-9 and KG-99 have an open-end upper