The Glock 19 is the best selling handgun not only in the United States but also in the entire world. This is a compact pistol with a large magazine capacity that many other handguns try to emulate. For example, the CZ P10C and S&W M&P 2.0 Compact and Walther PPQ are all designed to compete specifically with the Glock 19. The main advantage to the Glock 19 is the fact that it is small enough to conceal carry inside the waistband and large enough to fight with, and 15 rounds is plenty of firepower for self-defense. It also has a low bore axis and is very customizable as well.