The Armourers Association
http://www.armourersandbrasiers.co.uk/index.htm
VDB
http://www.vdb-waffen.de/
(Association Of German Gunsmiths and Registered Firearms Dealers )
Department for Innovation, Universities and Skills ( DIUS)
http://www.dius.gov.uk/
Büchsenmachermeister im Handwerksregister
http://www.hwk-os-el.de/
(German Department of Trade and Industry Osnabrück – Emsland)