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Magpul PMAG GL9 All Glock 9mm All Glock 9mm Double-Stack 9mm 21 Round Polymer Black Magazine
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$19.99
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SKU: MGMPI661BLK-840815109709
Overview
Built for Glock 9mm double-stack pistols, this magazine provides 21-round capacity while meeting the overall length requirements for a 14MM competition magazine. It is compatible with full-size, compact, and sub-compact variants, though it will extend below the grip. Practical details include a flared, easily removable floor plate, round-count indicator windows on both sides, and a design that drops free whether loaded or unloaded.
Why Hunters Choose the Magpul
21-round Capacity
Additional ammunition without expensive extensions
Compatible Full-size,
Full-size, compact, and sub-compact double-stack
Meets Overall
Length requirements for a 14MM
Flared, Easily
Removable floor plate supports straightforward
Magazine Indicator
Windows show 1, 15, and
Key Features
- 21-round capacity in 9mm Luger
- Compatible with full-size, compact, and sub-compact double-stack Glock 9mm variants
- Meets overall length requirements for a 14MM competition magazine
- Flared, easily removable floor plate
- Magazine indicator windows on both sides show 1, 15, and 21 rounds remaining
- Drops free loaded and unloaded
Best Used For
- Competition shooters needing 14MM-compliant magazine length with added 9mm capacity
- Owners of full-size Glock 9mm pistols wanting compatibility across double-stack variants
- Users who prefer a magazine with round-count indicator windows for quick status checks
- Shooters looking for a polymer magazine that drops free loaded or unloaded
- Anyone accepting slight protrusion below the grip for increased capacity
Specifications
| Blade Finish | Black |
|---|---|
| Caliber | 9mm Luger |
| Capacity | 21 |
| Compatibility | All full-size, compact, and sub-compact double-stack Glock 9mm variants |
| Competition Magazine Length Requirement | 14MM |
| Drops Free | Loaded and unloaded |
| Floor Plate | Flared, easily removable |
| Magazine Indicator Window | Both sides of body |
| Magazine Type | Double-Stack |
| Material | Polymer |
| Model | PMAG |
| Model Fit | All Glock 9mm |
| Remaining Round Indicators | 1, 15, and 21 |
Pros
- 21-round capacity provides additional ammunition without expensive extensions.
- Compatible with full-size, compact, and sub-compact double-stack Glock 9mm variants.
- Meets overall length requirements for a 14MM competition magazine.
- Flared, easily removable floor plate supports straightforward handling.
- Magazine indicator windows show 1, 15, and 21 rounds remaining.
- Drops free both loaded and unloaded for easier magazine changes.
Considerations & Trade-offs
- Compatible with all full-size, compact, and sub-compact double-stack Glock 9mm variants, but it will protrude below the grip on those platforms.
- Designed to meet 14MM competition magazine length requirements, so it is more specialized than a standard carry magazine.
- The 21-round capacity adds length and bulk compared with lower-capacity options.
- Magazine indicator windows are limited to 1, 15, and 21 rounds, so they do not provide a full round-by-round count.
Suggested Comparisons
- Pistol magazines
- Competition magazines
- Glock 9mm magazines
- High-capacity magazine options
Suggested Accessories
- Magazine pouch
- Range bag
- Cleaning kit
- Speed loader
Frequently Asked Questions
What Glock 9mm pistols is the PMAG GL9 compatible with?
It is compatible with all full-size, compact, and sub-compact double-stack Glock 9mm variants, with some protrusion below the grip.
How many rounds does this magazine hold?
The listed capacity is 21 rounds.
Does this magazine require an extension to reach its stated length?
No. The description says it meets the overall length requirements for a 14MM competition magazine without the need for expensive extensions.
What features help with round count checks?
It has magazine indicator windows on both sides of the body showing 1, 15, and 21 rounds remaining.
What are the listed material and finish?
The magazine is listed as polymer with a black finish.