According to law and order
How to secure your weapons in compliance with the law
Owners of weapons have a special responsibility. Weapons should be securely locked away so that no unauthorized persons or children have access to them.
In addition, the German Weapons Act imposes particularly strict requirements with regard to the storage of firearms. A weapons cabinet must have at least resistance grade 0 according to EN 1143-1, and in special situations even resistance grade 1 according to EN 1143-1.

Firearms disappeared
36,140 firearms lost from private ownership in Germany by the end of 2020

Weapons cabinets class 0 according to EN 1143-1
Since July 6, 2017, the following applies: Weapons such as rifles and pistols must be stored in Germany in a weapons cabinet with at least resistance grade 0 according to EN 1143-1. Ammunition can be stored in an interior compartment or a separate ammunition cabinet.
The weight of the gun cabinet is not specified - for class 0 gun cabinets, however, the following applies: if the weight is less than 200 kg, a maximum of five handguns may be stored in addition to the long guns. If the weight exceeds 200 kg, up to 10 handguns may be stored next to the long guns.

Weapons cabinets class 1 according to EN 1143-1
If an unlimited number of long guns and more than 5 handguns are to be stored, or if the gun cabinet is located in a building that is not permanently occupied, such as a clubhouse of sports shooters, then the storage of the weapons in a Class 1 gun cabinet - i.e. resistance grade 1 according to EN 1143-1 is mandatory. In the latter case, the tightening applies here that only a maximum of 3 long weapons may be stored in the weapons cabinet.