Well, it appears Colonial Arms made them for StarDot so if you look on their site (Col. Arms), you should be able to find virtually the same chokes. I just picked up a new C.A. SF for my 835, so when I receive it, ill def be posting my results. Agree with philippe too. 4s are ok, but you'll get much better patterns and killing power to 40 with 5s or 6s.