Something to be aware of, if it matters to you. My understanding from the CAS folks I associate with is that current production Uberti single actions all have their version of a firing pin block, allowing "safe" carry of six rounds in the cylinder. Uberti's design has proven problematic for some, but not all. One wonders why they did this as the large part of their customer base are the CAS crowd who by rule are only allowed to load five rounds for each stage. I suspect the safety Nazi lawyers have gotten to them.
Supposedly Pietta still offers some models with the traditional "4 click" lock work but there rumors they may give in to pressure and safetize their revolvers soon. Uberti used to offer the older lock work so you could revert a newer gun back to the original design. There was such a run on those parts they frequently ran out. Last thing I read was that they were going to stop offering the older stile parts before long.
Just FYI on what I've heard and read,
Dave