Description
The Kimber KDS9C +3 magazine extension takes your standard 15-round KDS9C magazine and bumps the capacity to 18 rounds. It's a simple accessory that does one job and does it well. Made from durable aluminum with an anodized finish, it integrates smoothly with the factory magazine body without any rattling or movement. The extension maintains the pistol's ergonomics while giving you those extra rounds when you need them.
How the KDS9C Extension Works
This extension fits specifically on OEM KDS9C 15-round magazines. It slides on the base and increases capacity by three rounds. The fit is snug and secure right out of the box, and the aluminum construction keeps things lightweight. Since it's made from the same quality materials as Kimber's other offerings, you get consistency across your magazines.
Feeding and Performance
The extension is designed to preserve reliable feeding when installed. Because it's a factory Kimber part made for their own magazines, compatibility isn't a guessing game. If you're running the standard 15-round magazine on your KDS9C, this extension works without modification. It integrates with the existing magazine spring and follower system, so you're not fighting against poorly matched components.
Built for Range Time and Matches
More rounds before reload translates to less downtime. Whether you're stretching out longer practice sessions or running through competition stages, the extra three rounds give you flexibility. The lightweight aluminum design doesn't add noticeable weight to your kit, and the black matte finish matches the standard KDS9C aesthetic.
Key Specifications
- Manufacturer: Kimber
- Manufacturer Part Number: 4200430
- UPC: 669278424309
- Caliber: 9mm
- Compatible Magazine: Kimber KDS9C 15-round
- Capacity Increase: +3 rounds
- Total Capacity After Installation: 18 rounds
- Material: Aluminum
- Finish: Black anodized
- Compatible Model: KDS9C
- Weight: 0.1 lbs
What’s Included
- Kimber KDS9C +3 magazine extension
Frequently Asked Questions
Will this extension work with my KDS9C magazines?
Yes, it's designed specifically for OEM Kimber KDS9C 15-round magazines. It won't work with aftermarket magazines or other calibers. If you're running factory KDS9C magazines, you're good to go.
Does the extension affect how the magazine feeds or locks in the gun?
No. The extension preserves reliable feeding by working with the existing magazine spring and follower system. It integrates seamlessly with the factory magazine body, so function remains consistent.
Is installation difficult?
Installation is straightforward, but Kimber recommends having a qualified gunsmith handle magazine modifications if you're not comfortable doing it yourself. The extension slides onto the magazine base, but getting it seated properly matters for reliability.
How much weight does the extension add?
The aluminum construction keeps things light. It adds minimal weight compared to the loaded magazine, so it won't noticeably affect how your KDS9C handles or carries.





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