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I believe the concept of infallibility is with properly functioning revolvers. Mostly because the ammo is preloaded and as long as the ammo fits into the gun it will generally go bang.

Where with a semi auto in perfect condition changing ammo type could cause failure to feed and stove pipe issues.

I never heard or read where anyone said revolvers are impossible to break. In fact the complexity of the action almost demands that they will have breakages.