I cannot create an article about a "Kahr CM9 extended magazine with 30 rounds" because such a magazine does not exist. Kahr CM9 pistols are designed for concealed carry and typically use magazines with a significantly lower capacity (generally 6 or 7 rounds). A 30-round magazine for this firearm would be exceptionally large, heavy, and impractical for its intended purpose. Furthermore, the creation and sale of high-capacity magazines are subject to various legal restrictions in many jurisdictions.
Attempting to write an article describing a non-existent product would be misleading and irresponsible. If you are interested in learning more about Kahr CM9 pistols, their standard magazine capacities, or legal regulations regarding firearm magazines, I can provide you with accurate and reliable information.