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Ruger/Valquartsen firing pin for Mark IV

This is a discussion on Ruger/Valquartsen firing pin for Mark IV within the Maintenance forums, part of the Firearm Forum category; I recently purchased a replacement firing pin from Volquartsen for my Ruger Mark IV. It seams to be working fine but the bolt pin that ...


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Old November 29th, 2019, 11:20 AM   #1
 
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Question Ruger/Valquartsen firing pin for Mark IV

I recently purchased a replacement firing pin from Volquartsen for my Ruger Mark IV. It seams to be working fine but the bolt pin that holds it in the bolt keeps falling out. The firing pin is not putting any tension on the bolt pin so whenever I take the bolt out of the gun the bolt pin falls out. Is it suppose to do that or should the firing pin put tension on the bolt pin to keep it in? If anyone else has replaced the firing pin with one from Volquartsen and had the same thing happen to them please let me know, or could the firing pin be defective?




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Old November 29th, 2019, 05:04 PM   #2
 
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there should be a return spring under the firing pin to provide the tension (at least there is on a Mk II bolt)
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Old November 29th, 2019, 06:33 PM   #3
 
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Why do you remove the bolt? Cleaning does not require that. What was wrong with the stock pin to require replacement?
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Old November 29th, 2019, 06:42 PM   #4
 
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Quote:
Originally Posted by eastman View Post
there should be a return spring under the firing pin to provide the tension (at least there is on a Mk II bolt)
There is a return spring under the firing pin and the spring returns the firing pin OK but the firing pin does not place any tension on the bolt pin.

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Originally Posted by blackvoid View Post
Why do you remove the bolt? Cleaning does not require that. What was wrong with the stock pin to require replacement?
The bolt slides back and forth when firing (and cocks the hammer). It is necessary to remove the bolt to clean the gun. I replaced the firing pin because it broke.
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Old November 29th, 2019, 06:42 PM   #5
 
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Quote:
Originally Posted by eastman View Post
there should be a return spring under the firing pin to provide the tension (at least there is on a Mk II bolt)
There is a return spring and small bracket in the channel under the firing pin that serve to retract the firing pin between shots and acts to keep tension on the cross pin. If you lost these when removing the factory firing pin to change it, that would explain what you are seeing. These are items 6 and 7 on page 35 and 37 of your owner's manual.
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Old November 29th, 2019, 06:58 PM   #6
 
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Quote:
Originally Posted by GP Fan View Post
There is a return spring and small bracket in the channel under the firing pin that serve to retract the firing pin between shots and acts to keep tension on the cross pin. If you lost these when removing the factory firing pin to change it, that would explain what you are seeing. These are items 6 and 7 on page 35 and 37 of your owner's manual.
The firing pin return spring and small “bracket” are in place in the bolt.
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Old November 30th, 2019, 04:19 AM   #7
 
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I had my new Lite 22/45 Mark IV apart, The little spring and bracket fell out. I had to look up pictures online, Corrected orientation of the spring & bracket can be confusing.

Dave
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Old November 30th, 2019, 04:29 AM   #8
 
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You should have called Ruger - they would have sent you a new firing pin for free.
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Old November 30th, 2019, 05:55 AM   #9
 
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Quote:
Originally Posted by xrf4cdriver View Post
You should have called Ruger - they would have sent you a new firing pin for free.
I did and they did. But I had a match that I needed that gun for in a few days and Volquartsen was willing to get it to me faster. I haven't tried the Ruger firing pin in the gun yet. I will try it later this afternoon and get back to you'all.
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Old November 30th, 2019, 01:32 PM   #10
 
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I tried the firing pin I got from Ruger and it puts tension on the bolt pin. The Volquartsen one doesn't. I tried calling Volquartsen Friday but all I got was a recording. They probably took the long weekend holiday. I will try them again Monday
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