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The GLOCK 17 was the first pistol designed and manufactured by the Austrian company GLOCK. It is a locked breech, short recoil 9 mm Luger semi-automatic pistol with a standard magazine capacity of 17 rounds of ammunition. It uses a modified Peter/Browning barrel locking system. The G17 showed up in the early 1980s for the Austrian Army weapons trials. It entered service under the designation P80.

GLOCK 17C/with rail-shown

Early reports about the GLOCK incorrectly suggested that it was a wholly plastic gun, and so would not show up on metal detectors. Because the slide and the barrel and many other internal parts are made out of metal, it does show up on metal detectors.

The GLOCK 17 has undergone two major revisions since its introduction, so the current model is called the 3rd generation GLOCK 17.

GLOCK has produced several variants on the 17:

• The GLOCK 17C (for "compensated") has a ported barrel and slide to reduce muzzle climb while shooting the pistol.
• The GLOCK 17L is a competition version with a longer barrel and slide.
• The GLOCK 18 and 18C are capable of fully-automatic fire.

Caliber: 9x19mm Parabellum.
Barrel length: 114mm.
Mass, empty: 625g
Ammo capacity: standard is 17+1 rounds, but can be anywhere from 10+1 to 33+1 rounds (the "+1" refers to an additional round in the pistol's chamber).

Two other GLOCK models are very similar to the G17. Both use the same frame, but have different barrels and slides because they are chambered for different cartridges:

• The GLOCK 22, chambered for .40 S&W.
• The GLOCK 31, chambered for .357 SIG.