Glock handguns are common sidearms among law enforcement agencies and military organizations around the world, and are also largely popular weapons amongst civilians for home defense, and concealed/open carry. The popularity of Glock pistols can be attributed to a number of factors. They are widely reputed as highly reliable, being able to function under extreme conditions and to fire a wide range of ammunition types (9mm, 10mm, .40 S&W, .45 ACP, .45 GAP, .357 SIG, .380 ACP; third-party conversion kits for .22 LR, .400 Corbon, .40 Super, and .50 GI are also available). The simplicity of the Glock design as well as its simple operating method contributes to this reliability, as it contains a relatively small number of components (nearly half as many as the typical handgun, each of these being interchangeable requiring no hand-fitting) making maintenance and repair easier and less costly. On December 10, 2019, Glock introduced their first production-Model .22-caliber Pistol, The Glock 44.