Interesting fact is that shotguns from non CIP member countries, some very cheap and rough shotguns, make it succesfully through proof in all CIP jurisdictions.

Which sort of raises questions about those that are made by prestigious makers but fail view or proof, and the effectiveness of Proof as a trade barrier.

Some familiar makes are Boito, Norinco, Miroku, Rossi, Magtech and all US made shotguns. Somewhat surprising that the above factories have the latest tooling and procedures that guarantee first time success in the Proof houses.