Major 2 ...It's interesting that your cylinder has the roll engraving on it. When you say it was made for an Uberti, do you mean it was custom made of of an original cylinder and utilizes an R&D back plate? I've just never seen one with roll engraving before. (By the way, it looks good.)
No Sir, it is an Circa 2004 R&D , he used to roll engrave...this is 5 shot just as his current models are.
OEM Uberti would be a 6 holer.... interesting you are the 2nd or 3rd person that has mention having never seen one with roll engraving before.
That is why those photo were taken, to show Kenny once did roll engrave.
I suspect the tool was finally worn out ( as Coffinmaker mentioned the Cylinders are quite hard )
While I'm about it I'll mention I purchased that Colt 2nd Gen. NIB in 1977-8 .
I used as C&B Reenacting Horse Cavalry near 30 years, then installed the LNIB R&D in 04
with the Buffalo Bros Grips...I was my main match but I use 44Colt Type ll now.
Only issue in all those years was a broken bolt spring... and that was within the first year I had it.