Howdy, Pard,
I haven't seen one lately, but a few years back they were a good piece of machinery, costing less than a Ruger Blackhawk or Old Model Vaquero. IIRC, the transfer bar setup was licensed from Ruger, and should function the same. One way to tell, is to see what happens to the transfer bar when you slowly lower the hammer from full cock and release the trigger just before the hammer is lowered fully. The transfer bar should retract so the hammer can't contact the firing pin. Conversely, with the trigger depressed as the hammer is lowered, the hammer should contact the firing pin. But, as I said, it's been a few years since I looked one... Personally, unless I were going into a situation where I knew I needed the sixth round, I'd still carry "only five beans in the wheel." Same with Rugers that have transfer bars.