Everything about Glock 21 Gen 4

About Glock 21 Gen 4

The Glock 21 Gen 4 as well as the whole Gen 4 series was introduced in 2010, when the series was introduced to the public. These series of polymer pistols has interchangeable grips and the update and shift to the new generation were centered on ergonomics and spring assembly. Glock manufacturer allowed for some gun parts to be interchangeable between different models. The first Glocks produced within the new generation were Glock 17 and Glock 22.

The difference that Glock 21 Gen 4 has compared to other  is that the21 Gen 4 has a smaller grip, the mag release is reversible to fit left handed users and also the trigger mechanism has been modified to fit the smaller grip. The last update on the Glock 21 Gen 4 was the resizing of the barrel shelf and slide. This is the difference bet The standard trigger housing pin was removed and replaced by a longer cross pin in order to mount the backstrap that increased the trigger distance by  2 mm or 4 mm (0.079 in or 0.16 in). With the backstrap installed, the grip size is identical to the Gen 3 pistols