Glock offered pistols chambered for the .357 SIG cartridge, a bottlenecked round developed in the 1990s. This cartridge combined the high velocity of the 9mm Parabellum with a heavier bullet, aiming for improved terminal ballistics. Several Glock models, including the G31, G32, and G33, were available in this caliber, offering users varying sizes and capacities.
The .357 SIG cartridge and its corresponding Glock variants gained popularity among law enforcement agencies and some civilian shooters. The higher velocity and purported enhanced stopping power compared to standard 9mm loads were attractive features. However, factors like increased recoil, higher cost of ammunition, and the continued advancement of 9mm ammunition technology eventually led to a decline in the widespread use of the .357 SIG.