The rugged reliability and safe carrying characteristics of the Ruger Single-Nine Single Action Revolver make it a superb sidearm to take along on most outdoor adventures, including backpacking, fishing, and big-game hunting. The Single-Nine is also a fun gun for plinking and a great choice for teaching shooters the fundamentals of handgun shooting. Ruger's patented Transfer Bar mechanism provides a block between the hammer and firing pin until the hammer is fully cocked all the way to the rear and the trigger is pulled. With the hammer down over a loaded chamber, the Single-Nine can be dropped directly on the hammer with no chance of the revolver firingan important feature for a sidearm carried in rough country. The frame, cylinder, and barrel are constructed with corrosion-resistant stainless steel for ease of maintenance in any environment. Chambered for the .22 WMRF Winchester Magnum Rimfire cartridge. The Ruger Single-Nine Single Action Revolver comes with a fixed, ramp front sight that facilitates drawing the sidearm from a holster, and an adjustable rear sight that can be precisely dialed in for hitting small targets with various types of ammunition. Manufacturer model #: 8150. Transfer Bar mechanism provides block between the hammer and firing pin Fixed, ramp front sight Adjustable rear sight Chambered for .22 WMRF Corrosion-resistant stainless steel frame, cylinder, and barrel