My 5-1/2 inch Uberti the lever catch (barrel stud) is just held in tight enough in the dovetail to stay in place, latched. With the lever down, the barrel studs can be pushed out of the barrel with my fingers. Sometimes the stud might prefer to move one direction more than the other, try pushing both directions to test it. If you can't press it out sideways with your fingers, use a brass or wood dowel and a small mallet. If they get too loose after some use and time, the dovetail can be tightened a bit with a few dimples punched at the edge of the barrel flat.
To disassemble, lower and remove the loading lever and press out the barrel stud, and the cylinder pin can be pulled out.