T/C Contender .410 21" barrel. What choke does this thing have? Choke options?

[Magdump]

Howdy folks, trying to build up a .410 turkey gun as a project and just bought a used but v. good condition factory T/C Contender .410 21" barrel online.   They have not made these in many years and they are hard to find and not cheap when you do!  But it will fit great with a blued Contender frame that I have gone on many adventures with over the years.

Anyone know what choke system these things used?  Any ideas on turkey choke options?  Trying to optimize the set-up for TSS #9s. 

Any information you can provide on such a long discontinued barrel is very much appreciated!  Here is a picture from the auction.  I can take more pictures/pictures of the choke in it when it arrives.

[BrowningGuy88]

I'd give William over at Sumtoy a call and talk chokes with him.

[Magdump]

Thats my plan actually unless by some miracle it patterns great in its stock configuration.