I had a pistol Thompson, it had a 10” barrel. I bought a Steel receiver and swapped that for the aluminum one that came on the pistol. In total I have two Thompsons. I do all of my own work (for the most part). I will be using the barrel wrench to also SBR the rifle 16” Tommy.
If I were you I’d take that barrel off, buy the one you want and get another cutts when they get some back in stock at the Kahr website.
you can always send your barrel away to get the cutts properly detached.
how is yours permanently attached?