The Glock 25 was introduced sometime in 1995 and made use of the .380 ACP cartridge - a low-recoil, rimless cartridge developed by John Browning. The Glock 25 followed much of the design of the existing Glock 19 family but designed specifically with the South American market in mind. Many South American countries restricted their civilian populations from carrying handguns in the military caliber so the Glock 25 was designed with the .380 ACP in mind.
Unlike previous recoil-operated Glock pistols, the Glock 25 model was a blowback-operated weapon with the double (safe action) function. As .380 ACP-chambered pistols did not require a barrel lock-up (specifically why John Browning designed the .380 ACP cartridge), the Glock 25 did not feature one. Beyond the base 15-shot magazine, other magazine capacities were available through a 17- and 19-shot counts, all angled and inserted into the base of the pistol grip. Overall length was 174mm (6.85 inches) with a barrel of 127mm (5 inches). Sights were located at the upper rear of the slide and just aft of the muzzle. The pistol grip was ergonomically designed.
Incidentally, the abbreviation "ACP" stands for "Automatic Colt Pistol".