Description
This is the genuine FMK factory magazine built for the 9C1 platform. It holds 10 rounds of 9mm and works with both Gen1 and Gen2 9C1 pistols, making it a reliable backup or spare for any FMK owner.
Construction-wise, you're getting a black steel body paired with internal components engineered for dependable performance. The high-tensile steel spring maintains consistent pressure even after extended storage, while the polymer anti-tilt follower keeps rounds feeding smoothly without tilting or binding. The removable polymer floor plate means you can easily take the mag apart for cleaning without any special tools or guesswork.
One practical detail that stands out is the factory-drilled and numbered witness holes at the 5 and 10-round marks. This lets you count your remaining ammunition at a glance without dropping the magazine. The feed lips are precision-engineered to fit snugly in the magazine well with zero wobble, and the overall design delivers a flush profile that works well for concealed carry setups.
FMK magazines are proprietary to their pistols, so this won't work with Glocks or other platforms, but it's exactly what you need if you run an FMK. Most owners report these work just fine for range trips and daily carry, making it a solid choice as a second or third mag for your collection.
Key Specifications
- Manufacturer: FMK Firearms
- Model: 9C1
- Manufacturer Part Number: M9C1M10
- UPC: 850979004246
- Capacity: 10 rounds
- Caliber: 9mm Luger
- Material: Steel body with polymer follower and base plate
- Finish: Black
- Follower Type: Anti-tilt polymer
- Compatibility: FMK 9C1 Gen1 and Gen2
- Spring Type: High-tensile steel
- Features: Factory-drilled numbered witness holes, removable floor plate, precision-engineered feed lips
What’s Included
- One FMK 9C1 10-round magazine
Frequently Asked Questions
Will this FMK magazine work with Glock or other 9mm pistols?
No, FMK 9C1 magazines are proprietary and only fit FMK 9C1 pistols. They won't work with Glocks or other major brands. This is by design to ensure proper feeding and reliability in your FMK platform.
Is this compatible with all generations of the FMK 9C1?
This 10-round magazine works with FMK 9C1 Gen1 and Gen2 models. If you have a Gen3, you'd want to verify compatibility or consider FMK's other magazine options designed specifically for Gen3 pistols.
What are the witness holes and how do they help?
The witness holes are factory-drilled indicators at the 5 and 10-round marks on the side of the magazine. They let you quickly count your remaining rounds without removing the mag from the magazine well or the pistol. It's a simple but practical feature for range shooting and tactical situations.
Can I disassemble this magazine for cleaning?
Yes. The removable polymer floor plate comes off easily, allowing you to clean the interior and inspect the spring without any special tools. This makes maintenance straightforward and helps extend the magazine's life.
How many rounds does this magazine hold?
This is a 10-round magazine designed for 9mm ammunition. FMK also makes 14 and 17-round versions for different needs and circumstances, but this standard capacity model covers most shooting applications.
What makes the anti-tilt follower important?
The anti-tilt polymer follower prevents the magazine spring and rounds from tilting or canting inside the body. This keeps the ammunition feeding smoothly and reliably into the chamber, reducing the chance of jams or feeding problems during use.





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