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I wonder why no one makes bolts like that?
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Probably because to make it free enough to roll, it would be free enough to pop out under the force of recoil, allowing the bolt to drag on the cylinder. Or, if it was tight enough to not pop out, it would soon enough gum up with residue and start dragging on the cylinder.
Even if it was a roller bearing held with a pin, it would still get gummed up. The innards of a revolver are pretty well sealed up, yet fouling still ends up in there. I think that it wouldn't take long before a bolt-tip bearing seized up.
I would be surprised if nobody had thought of such a thing before.