Glock 21 .45 ACP Pistol, by Pat Cascio
I still remember when the Glock 20 and 21 first came out, and I owned both, That was when I worked for the late Col. Rex Applegate. The Glock 20 is a 10mm pistol, and the Model 21 is chambered in .45 ACP. Other than the chamberings, both guns are alike in many ways. However, the 10mm version didn’t balance as nicely in my hand as the .45 ACP version did. Of course, the 10mm barrel is a little bit thicker, while the .45 ACP version has a barrel that is thinner because of the larger diameter bullet. You’d assume …