What Does the Glock Number System Actually Mean?

If you’ve ever stared at a Glock display case and wondered why there’s a Glock 17, a Glock 19, and a Glock 45 that somehow isn’t chambered in .45 — you’re in good company. The Glock number system is one of the most misunderstood naming conventions in the firearms world, and it trips up beginners and experienced shooters alike.