Description
This is the factory-original replacement magazine for your Grand Power P11, MK12, or Q1S in 9mm. It's manufactured to match the exact specifications of the magazine that came with your pistol, so you know fit and function are dialed in from day one. Whether you're at the range, in training, or carrying for defense, having extra mags keeps your gun running without pause.
The construction here is no-frills but thoroughly capable. You get a durable steel body with factory-drilled witness holes down the side so you can see your round count at a glance. The high-tensile steel spring pairs with a polymer follower to promote smooth, consistent feeding through your pistol. That polymer floor plate is removable for quick cleaning and maintenance without any fuss.
At 12 rounds, this magazine gives you solid capacity without bulk. Users consistently report that these mags lock securely, feed reliably, and eject cleanly. They fit the same way the originals do and perform the same way too. If you already own a Grand Power P11 or Q1S, picking up extra magazines is the smart move.
Key Specifications
- Manufacturer: Grand Power
- Caliber: 9mm Luger
- Capacity: 12 rounds
- Material: Steel body with polymer follower and floor plate
- Type: Factory OEM replacement magazine
- Features: Witness holes for round count visibility
- Spring: High-tensile steel
- Compatible Models: P11, P11 MK12, Q1S
- Manufacturer Part Number: GPP11MAG
- UPC: 8588005940047
- Color: Black
- Finish: Matte black
What’s Included
- 1x Grand Power 12-round 9mm magazine
Frequently Asked Questions
Which Grand Power pistols will this magazine fit?
This 12-round magazine is designed specifically for the Grand Power P11, P11 MK12, and Q1S models. It won't work with other Grand Power pistol lines, so make sure you're matching it to the right gun before ordering.
How do the witness holes on this magazine work?
The witness holes are factory-drilled along the side of the steel body. You can glance at them to see how many rounds you have loaded without unloading the magazine. It's a simple feature that saves you time at the range or in training.
Is this magazine easy to disassemble for cleaning?
Yes. The polymer floor plate is removable without any special tools, so you can take it off to clean the magazine body and spring if needed. It makes basic maintenance quick and straightforward.
How reliable is this magazine for self-defense use?
This is the factory OEM magazine made to the same specifications as what Grand Power includes with their pistols. Users report clean feeding, secure locking, and positive ejection. It's built to handle whatever you ask of your P11 or Q1S.
Can I load 13 rounds into this 12-round magazine?
Some users have reported being able to squeeze 13 rounds in by pushing the spring to its limit, but that's not recommended. The magazine is rated for 12, and that's where it functions best without excess wear on the spring.
Do I need multiple magazines for my Grand Power pistol?
Having at least 2-3 magazines is the standard for any pistol. Extra mags give you more range time without stopping to reload constantly, and they give you backup if one ever needs service. For self-defense, having a spare or two adds peace of mind.






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