From The Manufacturer/Wikipedia/People Smarter Than Us:
The Ruger® New Bearcat® is different from other single-action revolvers. Smaller, lighter, and based on older Remington® single-actions of the 1800’s, it has a one-piece cylinder frame that also forms its compact grip. It has been described as “a mechanical jewel,” and is the smallest and lightest 22 LR caliber single-action made by Ruger.