Your local sporting good store, or mail order house, will have their chokes identified by mfg type. Go in and ask to see Berreta 12 gauge chokes. They should have plenty.
Different gunmakers have different configurations regarding the location of threads, tube wrench slots, etc. For example: You can't put a Ruger choke into a stock Berreta/Franchi/Stoeger. You should be able to use any "Berreta type" choke into the same gauge of recent Berreta family shotgun.
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