Most likely the barrel has a single locking lug on a later model frame that won't release it. Nothing wrong that a new set of lugs won't fix. To remove the barrel, remove the trigger guard and use a screwdriver to pull back the locking lug from the underside. Once it is back far enough the barrel will lift out.
Call T/C and order a two-piece lug. Drive out the pin and toss out the single lug, replace with two-piece lug, drive the pin back in, install the barrel and go shooting.
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