Tightening A Ruger .22 Pistol Ejector
June 24, 2013
The steel frame Ruger .22 pistols such as the MK1 and MK2 were designed with ease of manufacture in mind. Complex machined components were avoided where possible and replaced with high quality stampings.
Accurate, reliable and inexpensive, Rugers seldom require the attention of a gunsmith except for custom work. One minor issue I run across when tuning Rugers is loose ejectors. The ejector is simply stamped sheet metal formed in a "U" shape and riveted to the frame. The rivet is soft steel and may work loose after thousands of brass cases have impacted against it.
Even when loose, the ejector can't go anywhere, since it is captured by the grooves in the bottom of the bolt but it could cause erratic ejection and should be fixed. I'd like to see the riveting fixture Ruger uses but I'm sure it's too elaborate for the home shop and to my knowledge no one makes one for gunsmiths so we had to design our own.
Basically, we just need a wedge that will slip under the head of the rivet in the receiver to act as an anvil while we peen over the other end. I used an old 8-inch flat file with the edges ground smooth and one side modified for a good tight fit under the rivet.
An old business card was inserted between the file and the receiver to avoid scarring. As the "anvil" was tapped into place under the rivet head, the peened-over end popped up slightly, revealing a gap between it and the receiver. All it took was some tapping from a small ball peen hammer and the rivet was re-set and the ejector tight.
A more sophisticated tool could be made from a spare bolt by welding up the bottom rail and re-cutting it at a slight taper on the milling machine so the bolt acts as a wedge and the ejector would stay aligned with both ears in the bolt grooves where they normally ride. But that's a project for another day.