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Magpul PMAG 21 GL9 - GLOCK Magazine 9mm 21 Rounds Black
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$19.99
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SKU: WX2*0705590
Overview
Built for Glock 9mm users who want extra capacity in a dependable range magazine, this 21-round option is suited to practice sessions, competition use, and general training. Its all-polymer construction, controlled-tilt follower, and stainless steel spring are paired with practical handling features such as a flared floor plate, side indicator windows, and dot matrix panels for marking. It fits full-size, compact, and sub-compact double-stack Glock 9mm variants, with some protrusion below the grip, so it is worth considering if a longer magazine profile is acceptable for your setup.
Why Hunters Choose the Magpul
21-round Capacity
For 9x19mm Parabellum use
Fits Full-size,
Compact, and sub-compact double-stack Glock
All-polymer Construction
Keeps the magazine durable and
High-vis, Controlled-tilt
Follower supports reliable feeding
Indicator Windows
Show 10, 15, and 21
Key Features
- 21-round magazine for 9x19mm Parabellum
- Proprietary all-polymer construction
- High-vis, controlled-tilt follower
- Easy-to-remove flared floor plate with ridged edges
- Long-life stainless steel spring
- Indicator windows on both sides at 10, 15, and 21 rounds
- Fits full-size, compact, and sub-compact double-stack Glock 9mm variants
Best Used For
- Ideal for Glock 9mm owners needing a 21-round magazine for range sessions or practice drills.
- Suited to competition shooters who need a magazine meeting 140mm overall length requirements.
- Useful for users wanting a magazine that fits full-size, compact, and sub-compact double-stack Glock 9mm variants.
- Good for shooters who prefer easy round-count checks through side indicator windows.
- Appropriate for owners who want a lightweight polymer magazine with a flared floor plate for easier handling.
Specifications
| Caliber | 9x19mm Parabellum |
|---|---|
| Capacity | 21 rounds |
| Color | Black |
| Compatibility | Fits all full-size, compact, and sub-compact double-stack Glock 9mm variants with some protrusion below the grip |
| Competition Mag Length | Meets overall length requirements for a 140mm competition mag |
| Construction | All-polymer |
| Drop Free | Drops free loaded or unloaded |
| Floor Plate | Easy-to-remove flared floor plate |
| Floor Plate Features | Ridged edges for enhanced grip |
| Follower | High-vis, controlled-tilt follower |
| Identification Marking | Dot matrix panels on the bottom of the body |
| Indicator Windows | On both sides at 10, 15 and 21 rounds |
| Material | Durable, lightweight polymer |
| Spring | Long-life stainless steel spring |
Pros
- 21-round capacity for 9x19mm Parabellum use
- Fits full-size, compact, and sub-compact double-stack Glock 9mm variants
- All-polymer construction keeps the magazine durable and lightweight
- High-vis, controlled-tilt follower supports reliable feeding
- Indicator windows show 10, 15, and 21 rounds
- Flared floor plate with ridged edges improves grip and removal
Considerations & Trade-offs
- This is a 21-round magazine, so it offers more capacity than standard Glock 9mm magazines, but that also means more protrusion below the grip on compatible pistols.
- It is designed for full-size, compact, and sub-compact double-stack Glock 9mm variants, but the fit note says there will be some protrusion below the grip.
- The magazine meets overall length requirements for a 140mm competition mag, which makes it relevant for competition use but not a universal fit for every setup or rule set.
- Polymer construction keeps it lightweight and durable, but buyers who prefer a metal-body magazine will want to note the all-polymer design.
Suggested Comparisons
- Glock 9mm magazines
- 21-round pistol magazines
- Competition pistol magazines
- Polymer magazines
Suggested Accessories
- Magazine loader
- Magazine pouch
- Range bag
- Cleaning kit
Frequently Asked Questions
What Glock 9mm pistols does this magazine fit?
According to the product data, it fits all full-size, compact, and sub-compact double-stack Glock 9mm variants, with some protrusion below the grip.
How many rounds does the PMAG 21 GL9 hold?
It is a 21-round magazine for 9x19mm Parabellum.
Does this magazine have round-count indicators?
Yes. It has indicator windows on both sides at 10, 15, and 21 rounds.
What construction and follower features are listed?
The magazine uses proprietary all-polymer construction and includes a high-vis, controlled-tilt follower.
Is there anything notable about the floor plate?
Yes. The product lists an easy-to-remove flared floor plate with ridged edges for enhanced grip.