45 Auto, also known as 45 ACP is a beefy cartridge developed in 1905 by John Moses Browning. Glock has a new take on that cartridge, melding a relatively modern design with the 115-year-old round.

Here’s What You Need To Remember: The Glock 21 is a bridge between new and old, mating a powerful old favorite round with modern handgun technology. The gun not only succeeded in the civilian market ...