All of this is despite the fact that the Colt M1911 isn't commonly chambered in 9mm and, even if it was, it still possesses a single-stack magazine design, therefore making it impossible to fit 17 rounds into the magazine without completely redesigning the weapon.
In GTA III, GTA Vice City and GTA San Andreas, the pistol resembles a Colt M1911 in shape, and its magazine capacity ranges from 12 rounds (in GTA III) to 17 rounds (GTA Vice City onwards). As such, this makes the availability of the pistol in the game chronologically accurate. At the time of GTA London (1969), the Hi-Power would've been one of the main service pistols of the British Army. In GTA London 1969, the pistol's HUD image resembles a nickel-plated Browning Hi-Power. In GTA 1 the pistol's HUD image appears to be a Soviet Tokarev TT-33. In every game since GTA III, this weapon is the standard armament of many gang members and all police officers on patrol. In Grand Theft Auto: San Andreas, Grand Theft Auto IV, Episodes From Liberty City, and Grand Theft Auto V, the weapon is significantly more effective, partly because it's possible to kill a target in one shot to the head also, in GTA IV, EFLC, and GTA V, the pistol can be used as a drive-by weapon. From Grand Theft Auto III onwards, the pistol is given generally poor stopping power, average accuracy, and a fairly short range. In its original form in GTA 1 and GTA 2, the pistol is one of the least effective firearms of them all, firing only one bullet every second or so, at a rate slower than a machine gun. The pistol is mainly used at the start of the game, or later when the player has run out of ammunition for better firearms.