Glock 17 is a beta weapon in GTA San Andreas.
The colloquially named Colt pistol of GTA San Andreas is based on the Colt M1911A1. However, there are many discrepancies between the statistics of the real-life Colt and the in-game one. The Colt is referred to as a 9-millimeter and has a 17 round magazine, but in real life, the Colt fires .45 caliber rounds and usually holds 7 rounds per magazine. This is because the Colt was originally going to be a Glock 17 pistol, but was changed.
While not usable by the player, the Glock can still be seen in cut-scenes, most notably wielded by Jimmy Hernandez and Eddie Pulaski in the opening scene of the game, Ryder in the first cutscene of the mission Ryder and later by Mike Toreno in his own titled mission, Mike Toreno.