I've looked at the "Weapons Law of 1996" (in german), specifically §2 (2), which states that regulations of firearms also extend to the barrel, the drum and the breech.
I am uncertain if this also extends to magazines, given that I can simply go into a gunstore and buy a magazine for a category B weapon without any sort of validation.
In relation to that: Would I be able to buy a magazine online and have it shipped to me?