Ruger Pistol Forums banner

Conversion of Ruger Mark IV Semi & Single Shot

2534 Views 3 Replies 3 Participants Last post by  olgdogTim
Just had my Ruger Mark IV .22 pistol converted to a dual semi auto and single shot that makes my suppressor about 5-10 decibels more quiet. It has a fire control selector Titanium knob installed in the regular Ruger bolt. By turning the selector knob 90 degrees it locks the bolt operation making it a single shot pistol which results in a higher velocity of the bullet and reduces the noise of the cycling bolt and escaping gas.

It looks neat, easy to operate and when firing in my integral suppressed Mark IV, is much quieter. I also add one to Ruger Lite 22/45.
Nickel Auto part Gun accessory Automotive exterior Fashion accessory
Revolver Air gun Trigger Gun barrel Gun accessory
Air gun Trigger Gun barrel Gun accessory Metal

Thoughts and comments?
See less See more
1 - 4 of 4 Posts
That is neat. Where did you get the bolt lock accessory?
In cooperation with my nephew (an 07 licensed firearm manufacturer and master machinist) we designed the bolt lock to fit the Mark I, II, III & IV pistols. They are CNC machined in Ohio and installed in the pistol after machining a locking groove inside the rear of the receiver. You can see the bolt conversion on GunBroker under "Ruger Mk I, II, III, IV Conversion Bolt - Semi Auto/Single Shot".

I just purchased a new chronograph set up (delivered this week) to better check the ballistics in semiauto vs the single shot mode but weather has prevented the test. Also have a newer sound meter on the way to better record decibel levels between the firing modes. Thanks for the reply.
  • Like
Reactions: 1
What no test results it's been a year.
1 - 4 of 4 Posts