Here's what I know. I shot my buddy's kicks choke in my 835. Devastating pattern. Great choke. I made a mistake though. I heard comp-n-choke was made by the same company as the gobblin thunder and shot about the same. I saved a measely 10 bucks by buying the cnc. It made a much better pattern than my factory choke, but not nearly as good as the gobblin thunder. The one I shot was a .685, I would definetly recommend one.