g19 means: G19 is the compact Glock 19 15rd 9mm handgun. It’s extremely accurate and reliable. G17 is the largest and most popular Glock 9mm, G18 is not available in USA, and G19 is probably the most commonly Glock 9mm on the civilian market. The pistol’s small frame and large magazine capacity make it ideal for intermediate rounds. Glock’s smallest 9mm pistol is the G26 compact. Although this small firearm can hold 10+1 rounds, it is still bulky and heavy. Because of its manageable recoil and effectiveness, 9mm is popular. Glocks have a reputation for being simple, accurate, reliable, and most importantly, they are easy to use. (in Community Dictionary, added by Sandra Fernández)