The G39 is the subcompact variant of Glock's .45 GAP (Glock Automatic Pistol) caliber family. Single-stack 6-round magazine. The .45 GAP was designed to deliver .45 ACP performance from a 9mm-sized case, allowing .45 caliber in Glock's smaller frame. Type: Pistol Action: Semi-Automatic Caliber: .45 GAP Capacity: 6 Year introduced: 2003, Austria Weight: 19.33 oz Overall length: 6.3" Status: Discontinued Intended use: Concealed Carry, Law Enforcement Backup