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Fred, this is threaded for the Beretta/Benelli Mobilchoke system so any chokes meant for that pattern should work fine.
Fred, the Girsan is compatible with 12ga Benelli/Beretta Mobile Classic Chokes. You can use this "Compatibility Chart" here : https://www.patternmaster.com/products/1001_12ga_Benelli_Beretta_Mobile_Classic
the standard MC312 uses the beretta chokes however I think the HDT uses different chokes But I have not been able to find that answer so I suggest that you contact EAA who is the Girsan importer to get a accurate answer Customer Service Hours 8:30am – 3:30pm EST (321) 639-4842 tel (321) 639-7006 fax or link https://eaacorp.com/contact?form=1
