Nadya in a sling bikini posing with the Glock 17, the Austrian pistol which took the world by storm back in the 1980s. With the original Glock 17 coming in the form of a full-sized 9x19mm service pistol, the design was eventually adapted to a wide range of sizes and calibers and even into a fully automatic machine pistol with the Glock 18. In its many iterations, the Glock has become the sidearm of choice for law enforcement agencies, militaries, and civilians around the world.