Magpul PMAG 21-Round GL9 9mm Magazine for GLOCK 17 - Black

Manufactured by Magpul Industries
Manufactured by Magpul Industries
20 Reviews

In Stock

Standard orders will ship out in 1 business day (M-F) if ordered by 3:30 pm CST. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination. NFA items will take longer to ship and are dependent upon ATF processing times.

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Magazines considered High Capacity are controlled by the ATF and/or local jurisdictions are not available for purchase/shipment in all areas.



Magpul continues to grow and develop based on innovation, simplicity, and efficiency. At Magpul, mission driven requirements inform their product design, materials, and manufacturing, focusing on efficiency without sacrificing quality or performance.The PMAG 21 GL9 is a 21-round 9mm handgun magazine for Glock featuring a proprietary all-polymer construction for reliability and durability over thousands of rounds. Meeting the overall length requirements for a 140 mm competition magazine, the PMAG 21 GL9 offers additional capacity without the need for expensive extensions.High visibility controlled-tilt follower, stainless steel spring, easily removable floorplate for cleaning, paint pen dot matrix for mag marking, ridged floorplate edges for better grip, and capacity indicator windows. Drops free loaded or unloaded.NOTE: The PMAG 21 GL9 is compatible with all full-size, compact, and sub-compact double-stack Glock 9mm variants with some protrusion below the grip. Features:
  • Compatible with all full-size, compact, and sub-compact 9mm double-stack Glock handguns
  • Durable, lightweight, and extremely stiff polymer construction
  • High visibility controlled-tilt follower
  • Long life stainless steel spring
  • Flared, easily removable floor plate
  • Dot matrix panel
  • Magazine indicator windows on both sides of body at 10, 15, and 21 rounds remaining
  • Drops free loaded or unloaded
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Caliber Gauge9mm Luger
Magazine Capacity21
ManufacturerMagpul Industries
PlatformGlock Magazines
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

20 reviews

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AWESOME MAGS!! The only issue i have with these mags is that i don't have more! Work perfectly in all my Glocks, and Glock mag running carbines.

Excellent, but with one drawback


-Cheaper than OEM Glock mags
-100% reliable with grass cased ammo
-Lighter than Glock brand mags

-Very unreliable with steel case ammo, rounds stick and will not feed, also very difficult to load with steel case too. I get probably 5 or 6 stoppages in 20 rounds. It usually requires removing the mag and smacking it against something to get the rounds to unstick.

I will probably buy more, but with the awareness that steel case is a no go.

Perfect for a 9mm AR

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Bought to use in my Foxtrot Mike AR 9mm. Locks in tight and feeds like a dream. Couple hundred rounds through with no problems. Will be buying more and waiting for PA to get the 30 Round Magpul. Only gripe is they are not fun to load beyond 15 rounds if you don't have an assist of any kind.

Works for my Ruger 9mm Carbine, no issues!

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I just got a Ruger 9mm PC Carbine and needed "Glock" magazines, didn't realize when buying two that they are Magpul... but the price was right, and my PMags are my favorite in my AR. And it works just fine! The 21 round magazine is a nice length for the Ruger 9PCC, no failures so far.

Primary Arms

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These are P-mags, do they really need to be reviewed? I just wanted to say a word about Primary Arms, these guys are the shiznit! Ordered yesterday, received today! This is a great Texas company! Ordered after lunch and they still shipped them out same day. Great service guys! keep it up!

Works great in my AR9 pistol.

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Caught these on sale and bought several for my AR9 pistol build. They work flawlessly. Great price, great selection and Primary Arms fast shipping. I'm all in.


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I have run over 1000 rounds through 3 of these with zero issues. Works great and exactly what I was looking for at a great price.

Outstanding mag

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feeds well, drop free, last round slide lock...Magpul made a good one here...

Very nice

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Very well made, no issue.. I will order more.

Very functional

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Fit is perfect, function is perfect. Falls free when empty. Price is great.
I can't say about longevity since I just got them but so far so good and my impression is that they are pretty durable, maybe just under what the factory glock mags are. I wish they had the rear witness holes of the oem mags.