I had an Uberti walker, and I was not happy long.
The walker is a pain in the A to clean. The hammer spring is bowed in an unsual fashion, and must be clipped to a hook on the trigger guard under the grip. This is almost impossible to do without getting a pinch blood blister on your finger, wether your putting it in place, or taking it out.
My walker only seemed to be able to handle about 27grs of powder max per load, any more and the ball wouldn't seat down far enough to keep the cylinder from jamming.
The other problem I had with it was accuracy. At 20 ft. I had to aim belt buckle level on a IPSC target to hit center mass.
I sold the bloomin thing and bought an 1858 remington..... best thing I could have ever done.
Walkers make good boat anchors, not good for much else.
dont buy a walker.