It's removable or they wouldn't have packed the chrome barrel with the diagonal.
Look carefully at the inside around where the SCT barrel would thread. If you don't see setscrews, then it's just on there tight. After all, the body is not machined in one piece with the barrel, like TeleVue, so they threaded it in at some point. I don't recall any setscrews in that unit.
You might try a pair of rubber gloves to increase your hand strength or use a strap wrench. Either way, it'll unscrew. The thread in the body is the same 2" SCT thread as the ring on the SCT thread-on tube. That's why the chrome barrel threaded into the ring.
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