The full size Glock 22 chambered in .40 S&W is probably the most popular pistol in law enforcement today. For decades, police departments across the country have issued this pistol to their officers. It’s reliable, simple to operate and holds 15+1 rounds of the potent .40 caliber. Next time you walk by a police officer, take a look at their duty belt. Chances are you’ll see a Glock 22 in the holster.