The HK SP5K and MP5 are popular 9mm submachine guns produced by Heckler & Koch (HK). They are known for their reliability and widespread use among military, law enforcement, and civilian shooters.Both the HK SP5K and MP5 typically come with a standard 30-round detachable box magazine. These magazines are designed specifically for the 9mm caliber and are reliable and widely available.

It’s worth noting that laws and regulations regarding magazine capacity can vary depending on your location. Be sure to check your local laws to ensure compliance with any restrictions on magazine capacity or modifications to firearms.

If you own an HK SP5K or MP5 and are looking for spare magazines or replacements, you can typically find 30-round magazines from various manufacturers that are compatible with these firearms. It’s recommended to purchase magazines from reputable firearm accessory retailers or directly from HK or authorized dealers to ensure quality and compatibility with your specific firearm.