I have a Wanzl in similar condition, it is missing the bolt and the operating mechanism. I think it was an attempt to deactivate the gun before the ammunition became obsolete. If you are comtemplating making some parts I would appreciate it if you could double up. I also need a hammer, I do not think this may be such a problem as it is still of 'Lorenz' pattern can anyone our there help?

Regards

Ormicron