The Intratec TEC-9, TEC-DC9, KG-99 or AB-10 is a blowback-operated semi-automatic pistol. It was developed by Intratec, an American subsidiary of the Swedish firearms manufacturer Interdynamic AB. Introduced in 1985, the TEC-9 was made of inexpensive molded polymers and a mixture of stamped and milled steel parts, and the simple design of the gun made it easy to repair and modify. The TEC-9 developed a negative reputation for its association with organized crime, street gangs and mass shootings in the 1990s, most notably used during the Columbine High School massacre by Dylan Klebold. However, it was a commercial success, and over 250,000 were sold.