I picked up a used SS circuit Judge and it only has the 45LC choke (smooth). I think the 410 choke has some straight grooves to cancel out the twist. Has anybody found a source for chokes or rails? I have figured out that Marlin 1894/336/1895/Camp 9 rails match the acre hole pattern, but the screws are different sizes. Does anybody know what the thread pitch is on the Circuit Judge for the rail? I would prefer to buy a factory rail than to drill and tap out to Marlin threads, but I’m not completely opposed to it. Or, just buy some filler screws and leave it as it is. I would sure like to get the 410 choke.

Thanks in advance!