Patent ID: 8381425

Claim:
A changeover system for a hand gun, said system comprising: a first grip piece of a hand gun; at least two different barrels for bullets of different caliber able to be applied interchangeably on said first grip piece of a handgun; at least a second grip piece of the same hand gun type, provided for a smaller caliber, on which at least one security arrangement against interchangeability is provided, said at least one security arrangement against interchangeability which prevents the application of a barrel of a larger caliber on the second grip piece and comprises at least one engagement element on the second grip piece, said at least one engagement element on said second grip piece undergoes a form-fitting engagement with a corresponding engagement element on a smaller caliber barrel block, with this corresponding engagement element not being present on a barrel block provided for the barrel of said larger caliber, such that it is not possible to mount on the second grip piece the barrel block provided for the barrel of said larger caliber.