What’s the deal with glock numbering?

Glock has produced some of the most reliable and ubiquitous firearms in history.

Yet, there is often confusion about how Glock numbers its handguns—and the correlation, if any, to other Glock model numbers. For example, the Glock 19 holds 15 rounds. So, following that logic, the Glock 17 would hold 17 rounds.

The Glock 20 is a 10mm handgun. As is a Glock 40. Why wouldn’t the Glock 40 be a .40 S&W? Well, because the Glock 22 is a .40 S&W.

And the Glock that’s a .22LR? Well, it’s a Glock 44. So, obviously, the Glock 44 isn’t a .44 magnum because Glock never made such a thing.

And if you’re looking for a Glock that fires a .45 ACP round? Well, those are the Glock 21 and Glock 30.

There is a Glock 45, however, and it’s a 9mm, just like the Glock 43 and Glock 48.

So, how DOES Glock number its handguns?


GEN 1 Generation 1 is just one gun. The Glock 17. (The “17” comes from the fact that the pistol was the 17th patent obtained by the company.)

GEN 2 More sizes and calibers were introduced into the Glock lineup. The magazine baseplate was changed, along with other small changes. And some were made with Picatinny rails—these are sometimes referred to as Gen 2.5.

GEN 3 Grips had finger grooves added. Thumb rest scallops added. Rails as a standard option. Internal modifications including a cross pin above the trigger pin.

GEN 4 The Pistol grip was made slightly smaller. Plus, a modular backstrap system allowed for changes to the grip size. More texturing on the grip—and the magazine release is reversible for left-handed folks. GEN 5 Finger grooves removed. Flared magazine well. Trigger guard features a relief cut to allow for higher grips. Ambidextrous slide lock. Match grade barrels.

PLUS, CATEGORIES! In addition to model numbers and generations, Glocks are also classified by category. The categories are: Standard, Compact, Subcompact, Competition, Long Slide, and Crossover.

Standard is what it says. Pretty standard for duty and home defense. Barrel lengths of 4.49 and 4.61 inches.

Compacts are, well, maybe not that compact. Glock compacts have barrel lengths of 4.02 inches. Smaller than a Standard Glock, but not exactly small. Still, the most popular Glock size category. Subcompacts are intended by Glock for concealed carry. They feature barrel lengths of 3.43 or 3.78 inches depending on caliber. Frames are very short.

Slimlines are created to be concealed. Beavertailed frames, single stack magazines, textured grips, and a reversible magazine catch are some of the attributes.

Competition and Long Slide guns are predominantly competition shooting firearms. Frames are the standard size, with barrels and slides that are longer—allowing for higher velocity, and a longer sight radius, with lessened recoil and muzzle flip. For example, the Glock 34 is the Long Slide version of the Glock 17; they share the same frame, but have different “upper” parts.

Crossovers have full-sized grips, but compact slides. For example, the Glock 45 is a crossover that could almost be described as “a 17 frame with a 19 slide.”


I need Tylenol for my headache :face_with_head_bandage:


Hence the 1911, back in the day it meant one thing, a tried and true, reliable, uncomplicated.45ACP. NUFF said!

No special numbers needed, you know it when you see it, like pornography!


That’s why it’s called PERFECTION… :smiling_imp:
And all is easy to understand… :wink:


Now what’s the difference between the 45 and the 19X?
fwiw, I put a P80 CL together, has the 19 grip and 17 slide.
I call it my X19 :rofl:


…and the 40 is a 10…the 20 is a 10,but the 21 and 41 are 45’s…
I’m up on the 9’s and 10’s, I think,but haven’t a clue on the .357sig or


I had a friend, who lived and breathed Glocks…Owns every single model.Every.Single.Model.

Bought a Springfield Operator when it first came out. Only non Glock pistol he owned…and the guy fell in love.


Thanks for posting. Very informative


Is it question for us?


You lost me when you said Glock! :crazy_face: :crazy_face:


17th was Glocks’ 17th patent, so, the first pistol was the 17.

Each pistol that came out after it simply got the next number.

That’s all it is.

I still really wish the 40 had been a .22 though since the 22 is a .40

BTW the “compact” Glocks are smaller than a lot of other “compact” pistols out there. And you can’t really judge the size of a gun by the barrel length, some manufacturers fit a lot more barrel into a given space. Glock in particular, you will be very hard pressed (I don’t think it exists) to find a gun smaller than a G19 that has a 4" barrel and holds 15+1. The VP9 for years was the size of a G17 yet only had the capacity and barrel length of a 19 for example…and the VP9Sk with a pinky mag is damn near the exact same height as a G19 despite only havint the capacity of a G26 and the barrel length of a G43


A friend let me borrow it on a range day. My most hated round - and expensive.


I avoid buying firearms chambered in “hens teeth”, or even the more common but ridiculously priced stuff. Sitting next to my buddy, both pegging steel the other day, his rounds 5x the price of mine, and mine making a louder THWAP…then his scope base loosened up,and he was basically throwing $2.50 into the wind each pull until he realized the issue.


This will really bake your melon. The original Designated model number for the “1911” family is the Colt Model 0 (as in model Zero)


Try 32-20 for hens teeth. I may break down and buy brass on gun broker.


Welcome to the family @KELLEY3 and hope you stay here and enjoy your time here.