I just traded into a couple of used 1860 Armies by Uberti. On the older one, if I hold the gun in the normal horizontal position and very slowly cock the hammer, the cylinder doesn't quite rotate far enough for the bolt to completely drop into the notch. The amount short is very small. If you cock the hammer in any kind of normal fashion, the cylinder carries up enough. If I hold the muzzle pointing straight down at the ground, it doesn't matter how slowly or quickly I cock the hammer, the gun locks up perfectly.
I know I am splitting hairs and some may say "if it cocks OK in normal use, leave it alone". However, I like to stay ahead of potential problems before they happen. Hand spring weak? Same for bolt & trigger spring? Thanks for your reply.