try the following website, it is for Pure Gold Chokes. It has a list of dealers who can provide you with thier product. I know they have an exccellent choke for the SBEII. It is .670 constriction, and shoots all loads (4's, 5's, 6's,) well in lead or Hevi-Shot. Try the new Hevi-13 with this combo. AWSOME!!! Performance!!!