ORIGINAL: StrutnBPS
The Star Dot is a very hard choke to find. I have one in my safe. I had an 835, but sold it. I kept all of my chokes for it though. I plan on buying a 935 later.
I think they quit making the Star Dot. Or at least under the "star dot" name.
Again, I would suggest the Comp-N-Choke. I've seen more than one 835 with the CnC produce awesome patterns.
I have a 935 and i have had some problems out of it. the first 3 shots i shot in it with 3.5 loads a pin came out the bottom and i sent it off to a gunsmith and he fixed it for like $120 or something like that. It still dont work exactly right so im thinkin about sending it back to Mossberg and having them fix it. then i might sell it and buythe newfranchi or a benelli SBEII.