Magazines are the most common source of stoppages in any semi-automatic pistol, which makes them the part least worth economising on. A Glock magazine is a steel-lined polymer body with a follower, spring and floor plate, and the body profile is what determines what it will fit.
How fitment works
Compatibility runs on calibre and frame size, then generation. Larger-frame guns will generally accept magazines from smaller guns in the same calibre — a G17 magazine runs in a G19 — but not the reverse, since the shorter body will not reach the catch. Gen 5 magazines changed the body and follower, and the slim guns (43, 43X, 48) share nothing with the double-stack line.
Fitment chart
| Glock model & generation | Part | Notes |
|---|---|---|
| Glock 17 Gen 3 | View part | |
| Glock 17 Gen 4 | View part | |
| Glock 17 Gen 5 | View part | |
| Glock 19 Gen 3 | View part | |
| Glock 19 Gen 4 | View part | |
| Glock 19 Gen 5 | View part | |
| Glock 19X Gen 3 | View part | |
| Glock 19X Gen 4 | View part | |
| Glock 19X Gen 5 | View part | |
| Glock 21 Gen 3 | View part | |
| Glock 21 Gen 4 | View part | |
| Glock 22 Gen 3 | View part | |
| Glock 22 Gen 4 | View part | |
| Glock 23 Gen 3 | View part | |
| Glock 23 Gen 4 | View part | |
| Glock 26 Gen 3 | View part | |
| Glock 26 Gen 4 | View part | |
| Glock 26 Gen 5 | View part | |
| Glock 34 Gen 3 | View part | |
| Glock 34 Gen 4 | View part | |
| Glock 34 Gen 5 | View part | |
| Glock 42 All | View part | |
| Glock 43 All | View part | |
| Glock 43X All | View part | |
| Glock 45 Gen 3 | View part | |
| Glock 45 Gen 4 | View part | |
| Glock 45 Gen 5 | View part | |
| Glock 48 All | View part |
Choosing and fitting
Buy OEM or a well-established aftermarket brand for anything you carry, and keep range-only magazines visually marked so they never end up in a defensive gun. Number your magazines: when a stoppage happens, knowing which magazine it came from is the difference between finding the fault and guessing at it.