Miki:
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<br>I am not familiar with it, but did a google search for quickchoke and found a description of the gun from Breda(in Italian, of course) which apparently came from the factory with those tubes.
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<br>I clicked the Breda site and nothing came up. I don't know if they are still in business or not. There was also an email address for the distributor, but he is probably an Italian distributor. However it can't hurt to email him and see what happens.
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<br>You might try them on your computer. The Breda site was listed as
www.breda.armi.it<br>
<br>and the distributor's email was
Roberto.massarotti@otomelaria.it Hope this helps. Does the gun have an American importers name on it, perhaps?