Those cylinder notches look a little shallow on a "questionable" cylinder make ( for a prop gun). Making sure the bolt is contacting the bottom on the tall side of the notch should keep that from happening. The cylinder may not have much if any kind of heat treatment.
The Uberti cylinders should hold up pretty well though usually the material will "upset" slightly on the tall side when cycled rapidly. That's a lot of weight spinning even when unloaded. If you tap it down ( I use a tack hammer that was my dad's) a couple of times, it'll work harden it enough to not be a recurring problem.
Since I install an action stop, I make sure there is slight play in the cylinder at full cock ( thumb still on hammer) meaning no hand / ratchet contact. That's obviously a notch saver in itself. A bolt block is always a good addition as well to keep throw-by at bay.
Mike
Ps, I always "back cut" the tall side of the bolt. That keeps the bolt from contacting the edge of the notch but the "bolt head" (down in the notch) is still full width.