The Glock 21 is a striker-fired, semi-automatic polymer pistol that is chambered in .45 ACP. The Glock 21 features a 4.61-inch barrel and an overall length of 8.23 inches. Weighing in at just 26.46 ounces, its relatively light weight combines perfectly with an ergonomic shape that makes carrying the pistol extremely comfortable despite its full size. A trigger pull of approximately 5.5 pounds is joined by a trigger travel of just half an inch to provide for exceptional performance. The pistol has an effective range of 50m and features adjustable sights that consist of a ramped front sight and a notched rear sight, perfect for acquiring targets quickly and easily. As noted, each pistol comes with two 13-round box magazines.

Like all other Glocks, the Glock 21 features the “safe action” system, which consists of three passive, independently operating mechanical safeties. Though the pistol has no manual safety, its three internal safeties work seamlessly to prevent accidental discharges and safety hazards. The trigger safety is a small lever on the trigger itself that prevents rearward movement of the trigger unless both the trigger and trigger safety are depressed simultaneously. The firing pin safety is a spring-loaded device that blocks the firing pin channel, preventing any forward movement of the firing pin unless the trigger is depressed. Finally, we come to the drop safety. When engaged, the rear of the trigger bar rests on a drop shelf. When the trigger is depressed, the bar moves off of the shelf until it is fully separated from the firing pin lug, allowing the firing pin to move forward. All three safeties are engaged when the trigger is forward. Once the trigger is depressed, each safety disengages sequentially to allow a discharge. When the trigger is released, all three safeties automatically reengage. Though the four cardinal rules of firearm safety are enough to prevent all accidents, the “safe action” system employs the idea that the pistol can only be discharged by an intentional trigger pull.