Facing 25 or 30 thou off the front of the cylinder would be a straightforward lathe operation. Set it up in the chuck so that the face of the cylinder is absolutely perpendicular to the spindle axis, then set the micrometer carriage stop or dial indictor and cleanly face off the cylinder. The cylinder could be fitted exactly to your frame and barrel. Custom fit as opposed to one size fits all.
I have no experience with Ubertis. I do know that when parts are installed on a Pietta frame, interchangeability is remarkable. Cylinders, barrels, etc.
Years ago I bought a project grade Centennial Arms (Chicago) 1860 reproduction. These were among the first c&b repros to appear during the Civil War centennial. Made in Belgium. A real copy of a Colt. Imperial dimensions, threads, etc. It had a buggered cylinder pin. Made one on the lathe out of a die makers bolt. Cutting the slot for the wedge was interesting. It is an excellent shooter, accurate.
I have no experience with Ubertis. I do know that when parts are installed on a Pietta frame, interchangeability is remarkable. Cylinders, barrels, etc.
Years ago I bought a project grade Centennial Arms (Chicago) 1860 reproduction. These were among the first c&b repros to appear during the Civil War centennial. Made in Belgium. A real copy of a Colt. Imperial dimensions, threads, etc. It had a buggered cylinder pin. Made one on the lathe out of a die makers bolt. Cutting the slot for the wedge was interesting. It is an excellent shooter, accurate.
