In 1983, the 10 mm semi-auto pistol cartridge made its debut. Developed by Jeff Cooper as a more powerful man stopper, the new cartridge was originally paired with the “Bren 10” pistol designed by Michael Dixon and Thomas Dornaus. Both the cartridge and the handgun generated plenty of excitement in the shooting community at the time. Unfortunately, the Bren 10 ran into production problems that limited it to a small 1,500 unit run of between 1983 to 1986. Despite the failure of the first pistol chambered for the potent 10 mm, the enthusiasm for the cartridge was still strong enough to induce Glock to step in and develop a shooting solution based on its pistol design.
The Glock Model 20 was developed in 1990, with an official launch in 1991. Since its inception, Glock has been dedicated to producing reliable semi-auto pistols, primarily for law enforcement and military applications, thus the G20 was a full-size duty sidearm designed with uniformed personnel in mind. At the same time, the company recognized civilian shooters would find additional applications for this potent pistol and cartridge combination. They advertized the G20 as a “Perfect 10,” for safe, reliable handgun hunting.