Shotgun choke key queation

I think they are manufacturer dependant.

Pretty sure my Franchi auto and Zoli O/U are different.

100% the bit of angle iron I had for an early hatsan is different but it was a good few years ago.
 
There seem to be a lot of different sorts. Even the Browning ones are different between models! The Teague ones are an interference fit and therefore fit all. (Calibre dependent)

David.
 
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