Martin B. Retting
11029 Washington Blvd
Culver City, CA 90232
Phone: (310) 837-2412
I got it back in the 1960’s
It’s made for the colt 1851 but works great on my Pietta .44 Remington 1858 and fits just fine. On your Uberti I do not know.
You should machine a notch on the bottom of the grip for the stocks clamp to latch on to. And you must have the oversized replacement hammer screw. I made my own hammer screws