Look on ebay, they have a tube there now for $9, don' t know what kind it is, do a search for (turkey tube or turkey choke) there was truglo strut stopper SP-10 on there a couple of days ago that went for $30 new. I shoot a Truglo Strut stopper in my SP-10 and get very good consistent patterns. Hastings, Kicks, Comp n Choke, Rhino, Briley all make tube to fit 10 ga. and they are black and don' t shine