After seeing this post I told a buddy of mine to get a Carlson's TSS turkey choke in Beretta/Benelli threads for his Cobra II. He did and the choke tube would not thread into the barrel. He called Tristar and they said that this happens, and sometimes the factory in Turkey cuts the threads at a slightly different pitch, and if he would send in the barrel and choke tube they would chase the barrel threads to ensure the Carlson's choke tube would fit. He sent it in and had it back 7 days later. Choke tube works perfectly now. Definitely have to say Tristar's customer service is pretty impressive.