Factory HK 12-round CC9 magazine fitted with HK Parts' +3 extension.

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HK Parts builds this 15-round CC9 magazine from a factory German 12-round magazine and a +3 extension. It arrives fully assembled, providing a middle step between the factory extended 12-round magazine and the longer 17-round option.
The three additional rounds cost some concealment at the grip, but less than the +5 configuration. That makes the 15-round version the more balanced extended magazine for a CC9 that still sees concealed-carry use, while the 17-round magazine remains the capacity-first range or spare choice.
Add the HK Parts CC9 9mm 15rd Magazine to your build and see how it enhances your platform.