Glock 21 Magazine Base Plate Fit Guide
The Glock 21 and its magazines have ridden in duty rigs and carry holsters for years, and the base plate is one of the few parts of the gun everyone standing next to you can see. Before you drop a custom 214 base plate on your G21 mags, here is the one thing that trips people up — and it is simpler than the internet makes it sound.
The base plate you need is set by the magazine's frame family, not by which generation your pistol is. Every generation of G21 magazine takes the exact same base plate. The generation stamped on your slide does not change the fit, so skip the 'what gen am I' question and match the plate to the magazine family.
The short answer for G21 owners
The Glock 21 is a large-frame .45 Auto, and it shares the wide large-frame magazine body with the G20. The 214 large-frame base plate that fits a G21 mag also fits G20, G29, G40, and G41 mags. It is a different, wider plate than the standard 9mm/.40 family.
Your Glock 21 is a large-frame Glock, so order the large-frame base plate — a direct fit across every generation of G21 magazine, including the .45 SF frames.
214 magazine base plate fit chart
Every Glock magazine falls into one of four base plate families. Find your model and you'll know which 214 plate to order, regardless of generation:
- Standard double-stack — Glock 17, 17L, 18, 19, 19X, 22, 23, 24, 26, 27, 31, 34, 35, and 45. Also fits the PSA Dagger, which runs Glock-pattern magazines.
- Large-frame — Glock 20, 21, 29, 40, and 41. Wider magazine body, so it takes its own plate.
- Slimline (43X / 48) — Glock 43X and 48, which share the same slimline magazine.
- Glock 43 — Glock 43 only. The single-stack 43 magazine is its own size.
Why generation doesn't matter
Glock changed grips, frames, and finishes across the generations, but the base of the magazine — the part the plate clips onto — kept the same footprint within each family. A 214 base plate has locked onto that same interface since the early guns, which is why one plate per family covers Gen 1 through Gen 5 without an adapter or a second version. Identify the family and you already know the plate.
Why the G21 gets its own page
The Glock 21 is the full-size .45 that many shooters carry and compete with. Its mag is in the large-frame family, wider than a G17 mag, so match the plate to the frame family, every generation.
Once the fit is right — make it yours
With the family matched, it's time to put your mark on it. Every 214 magazine base plate is laser engraved right here in Dallas, Texas — deep, permanent, cut into the metal itself, not a printed sticker that peels in a mag pouch. Run a Texas flag, an American flag, a unit crest, custom scrollwork, or one of our heritage designs. Order a matched set so every mag on your belt carries the same mark. Shop 214 Glock magazine base plates →
SIZES:
Standard double-stack - Fits Glock 17, 17L, 18, 19, 19X, 22, 23, 24, 26, 27, 31, 34, 35, 45 (all generations) and the PSA Dagger.
Large-frame - Fits Glock 20, 21, 29, 40, 41 (all generations).
Slimline - Fits ONLY Glock 43X and 48.
Glock 43 - Fits ONLY Glock 43.
DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.
DISCLAIMER: "GLOCK" is a federally registered trademark of GLOCK, Inc. and is one of many trademarks owned by GLOCK, Inc. and GLOCK Ges.m.b.H. Neither 214 Engravings nor this site are affiliated in any manner with, shape or otherwise endorsed by, GLOCK, Inc. or GLOCK Ges.m.b.H. The use of "GLOCK" on this page is merely to advertise the sale of GLOCK pistols, parts, or components. For additional genuine GLOCK, Inc. and GLOCK Ges.m.b.H. products and parts, visit www.glock.com.