The Ruger 22/45 pistol is a weapon designed specifically for target shooting and small-game hunting, and is one of the few pistols designed to fire the .22 Long Rifle cartridge. The gun bears a passing resemblance to the German-designed Luger pistol. These pistols are quite simple to take apart for cleaning and maintenance, and require no special tools beyond your own hands.
Remove the magazine from the pistol and pull the bolt back to ensure there are no live rounds chambered. Clearing your weapon of ammunition should always be the first step when working on a firearm.
Locate the lever on the back of the pistol grip and pull it out and up. This will release the bolt.
Keep your grip on the lever and pull it straight down until you hear a loud 'click' noise. Continue pulling downward until the lever pops out of the pistol.
Grip the bolt and pull it out the back of the receiver.
Push forward on the back of the barrel until you hear another loud popping 'click' noise. This noise denotes the barrel separating from the frame.
Pull the barrel up and off the pistol frame.