The Glock 19 Gen 3 in 9 mm Luger is ideal for a versatile role thanks to its reduced dimensions when compared to the standard sized option. In addition to its use as a conventional service pistol, The G19 Gen 3 is ideal for use as a backup weapon or for concealed carry purpose. The Mid-Size or Compact Glock 9mm is ideal for versatile use because of its reduced dimensions compared with the standard pistol size. The 19 Glock is known as the most balanced and comfortable sized Glock. Because of this, the Glock 19 is the most popular handgun in the USA.