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Volquartsen Accurizing Modification for Mark IV

This is a discussion on Volquartsen Accurizing Modification for Mark IV within the Ruger Rimfires forums, part of the Pistol & Revolver Forum category; I won't get the disconnector until later in the week and was too curious about what another sear spring would be like so I stopped ...


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Old April 17th, 2017, 05:21 PM   #61
 
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I won't get the disconnector until later in the week and was too curious about what another sear spring would be like so I stopped and picked up some .024" music wire today and make a quick spring as a test. The red spring from Ruger is .029 wire and my first test was to make one out of .024" wire as close to the same shape as possible to see the change in the trigger. The new spring dropped the trigger from 3.5 to 2.5 lbs. The reset still feels good but the real test will be live fire with one round at a time to start. When the disconnector comes in I'll put back the stock spring to be able to see if it makes any difference.

I was going to post a picture of the 2 springs but can't due to post count. I was going to try and help but it's not allowed yet.



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Old April 17th, 2017, 07:34 PM   #62
 
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Quote:
Originally Posted by GreggK View Post
so I stopped and picked up some .024" music wire today and make a quick spring as a test.
WOW, I have worked with music wire before but to make a sear spring. I am impressed. Keep us informed. Interesting.
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Old April 18th, 2017, 01:47 PM   #63
 
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Got my replacement hammer and sear today and installed. The kit works now!

I do have one question though. I think I mixed up the springs that go under the plunger in the trigger. One spring is a larger wire diameter than the other. Does anyone know if VQ's kit came with the larger or smaller diameter spring?
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Old April 18th, 2017, 06:15 PM   #64
 
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Originally Posted by Bobert View Post
Got my replacement hammer and sear today and installed. The kit works now!

I do have one question though. I think I mixed up the springs that go under the plunger in the trigger. One spring is a larger wire diameter than the other. Does anyone know if VQ's kit came with the larger or smaller diameter spring?
The VQ kit comes with the smaller diameter wire, my spring was about .003" smaller and the VQ spring in my kit was also a little darker in color.
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Old April 20th, 2017, 06:43 PM   #65
 
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I received the VQ disconnector today and installed it. Unfortunately it didn't do much for my trigger pull. The pull went from 3 lb 6oz to 3 lb 4oz with the disconnector. I switched out the factory sear spring for the one that I made and the trigger is an even 2 lb now. There is still some more tweaking that I can do but I'm going to do some live fire testing of the new sear spring first. Here is a picture of the factory sear spring and the one I replaced it with.

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Old April 21st, 2017, 05:33 AM   #66
 
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Originally Posted by Bobert View Post
Does anyone know if VQ's kit came with the larger or smaller diameter spring?
About 40% of the trigger spring force goes into increasing the trigger pull weight, so VQ made theirs lighter. However, some have reported the VQ spring has caused trouble with consistent resetting of the trigger (the other 60%). So keep this in mind when choosing which one to use.
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Old April 21st, 2017, 05:40 AM   #67
 
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Originally Posted by GreggK View Post
I received the VQ disconnector today and installed it. Unfortunately it didn't do much for my trigger pull. The pull went from 3 lb 6oz to 3 lb 4oz with the disconnector. I switched out the factory sear spring for the one that I made and the trigger is an even 2 lb now. There is still some more tweaking that I can do but I'm going to do some live fire testing of the new sear spring first. Here is a picture of the factory sear spring and the one I replaced it with.

Very nice job making your own spring! The MKIII sear I bought from VQ came with a new sear spring for that model. I never tried the new sear with the Ruger spring, so I don't know how much the new spring actually helps.

I do find it interesting though, that your kit didn't reduce the pull weight as much as others who've installed it. Do let us know how your new spring works in practice. I love making my own mods and proving they're better than the aftermarket can supply!
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Old April 21st, 2017, 03:12 PM   #68
 
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Well, live fire went fine, rapid and slow fire there was no problem with the reset so I worked on the trigger return spring and got it to the same weight as my other MK's so now the trigger is a nice 1# 11oz so I'm finally satisfied with it. It was never going to be right without changing out the sear spring because it took a little over 2.5 lbs just to pull the return spring and then make the sear move without the hammer and main spring engaged. My sear spring was the biggest offender. The pistol was right at 6 lb pull when it was new out of the box. I don't know how this compares to other Mk IV's since this is the only example I have seen.

The person I talked to at Volquartsen seemed pretty certain that they were going to be offering a sear spring fairly soon.
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Old April 21st, 2017, 04:03 PM   #69
 
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Again, nice job making the spring. I had my MK4 22/45 dissembled and reassembled several times today trying to improve the trigger pull with the MK4 Volquartsen kit. No luck. I did discover that the the trigger pull is much lighter with the bolt removed. I have no idea what is going on.

Volquartsen is sending me a new disconnect. I am not having much hope that will fix the problem.

I polished the sear and hammer today also. No difference.

I was close to putting the sear spring from my MK4 Hunter (great 2 pound trigger pull) into the MK4 22/45 but did not do it.

Looking at my sear spring and your photos I notice a forward bend in the long leg of the spring. Again, I didn't take apart my standard frame MK Hunter and look at the spring.

Do you think that forward bend in the sear spring could be the issue with the heavier trigger pull? The forward bend would make for more spring pressure if I am thinking correctly.

I may take mine apart again tomorrow and straighten bend in the long leg.
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Old April 21st, 2017, 04:14 PM   #70
 
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[QUOTE=arlanarneberg;3072633]Again, nice job making the spring. I had my MK4 22/45 dissembled and reassembled several times today trying to improve the trigger pull with the MK4 Volquartsen kit. No luck. I did discover that the the trigger pull is much lighter with the bolt removed. I have no idea what is going on.[Quote]
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Old April 21st, 2017, 04:16 PM   #71
 
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Mess up my post trying to edit, Oh well
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Old April 21st, 2017, 05:41 PM   #72
 
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Originally Posted by arlanarneberg View Post
Again, nice job making the spring. I had my Looking at my sear spring and your photos I notice a forward bend in the long leg of the spring.
Do you think that forward bend in the sear spring could be the issue with the heavier trigger pull? The forward bend would make for more spring pressure if I am thinking correctly.

I may take mine apart again tomorrow and straighten bend in the long leg.
That bend in the long leg won't make any difference. That little bit of bend just helps it sit better in the pocket in the left side of the grip frame. You can remove the left grip and observe its action, you can wedge it forward and back in the pocket while checking the pull and should find it makes no real difference. That long leg of the spring basically just keeps the coil from turning on the sear pin.
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Old April 21st, 2017, 06:00 PM   #73
 
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Originally Posted by arlanarneberg View Post
Again, nice job making the spring. I had my
Volquartsen is sending me a new disconnect. I am not having much hope that will fix the problem.
The disconnector could help with the different trigger pull when the bolt is in since it rides up into the cutout in the bolt to prevent out of battery firing. If the disconnector can ride a little higher it will pull from a higher point on the sear with more leverage to pull the sear forward but it must also still disconnect when the bolt is pulled a little to the rear for the out of battery protection.
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Old April 22nd, 2017, 12:12 PM   #74
 
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You can remove the left grip and observe its action, you can wedge it forward and back in the pocket while checking the pull and should find it makes no real difference.
Thanks, I already tried that. You are correct.
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Old April 22nd, 2017, 12:21 PM   #75
 
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Originally Posted by GreggK View Post
The disconnector could help with the different trigger pull when the bolt is in since it rides up into the cutout in the bolt to prevent out of battery firing. If the disconnector can ride a little higher it will pull from a higher point on the sear with more leverage to pull the sear forward but it must also still disconnect when the bolt is pulled a little to the rear for the out of battery protection.
My disconnector is due Tuesday. I doubt it will do anything. I noticed last night that my trigger pull is in the the mid 2# range with the upper removed. I am stumped.
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