can you post a picture of your's?
that might help id what you have as to what is now being given out with the guns!
if I recall on the one's I had, (its been 10 yrs or so)
the difference I had in the one's I got from TC< there were different depths of the face concave, how deep they were, and then the cone shape was different on some as well
I also had some that had overall shorter lengths and amount of threads too!
as again I went back and forth with TC, as we went nuts trying to get mine to shoot(I think I went thru like 4-5 barrels from TC, as well as a good 6-8 breech plugs)
when I sold gun I gave new owners all items!
but MIGHT have 1-2 breech plugs , I'll have to look?
as I even had a few custom made to try different idea's