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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; Originally Posted by arlanarneberg My disconnector is due Tuesday. I doubt it will do anything. I noticed last night that my trigger pull is in ...


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Old April 22nd, 2017, 12:25 PM   #76
 
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Originally Posted by arlanarneberg View Post
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.
Actually it is mid 2# with the upper in place and the bolt removed. It is a little tricky getting the gun cocked again without setting the hammer to far back. Took making a special tool this morning to get the hammer out of the lay flat position I managed to get it into.



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Old April 22nd, 2017, 06:28 PM   #77
 
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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!
I gave the MKIV a good workout today, ran a little over 600 rounds through it with all kinds of ammo. I ran it suppressed and without. It ate most everything I gave it, it did choke on some old Rem golden bullets when they were so far out of spec that they wouldn't go in the chamber but I can't blame the gun for that. I did find some ammo that was worse than the golden bullets and that was some Winchester bulk ammo in a white box marked 555. Some of the 555 was so weak that it didn't even cycle the action. The pistol ran perfect on the Federal bulk ammo that I normally use, I was just burning up some of the old unreliable junk for practice.

This MKIV tacticle is starting to grow on me. The gun runs really flat for speed shooting (Steel Challenge).
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Old April 25th, 2017, 10:53 AM   #78
 
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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.
Got the new disconnector this morning and installed it. Works great now. Trigger pull is in the mid 2's.

I called Volquartsen and they were happy to hear that. They did say they are redesigning the sear to address the problem instead of sending out MK2/MK3 disconnectors.
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Old April 27th, 2017, 08:23 AM   #79
 
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M4 hunter

Love this Ruger forum. My first post. Thought I'd share my upgrade experience with my M4 hunter. I installed a Mark iii Volquartzen sear, a Mark ii hammer and hammer bushing I had left over from a previous modification and a TK mark iv trigger, with the original disconnector. The only issue I have is the pre-travel of the trigger. If I lower it, the trigger won't reset. The trigger pull is in the 2-3 pound range ( no gauge ), and very crisp. Any thoughts on the pre-travel. The post-travel is perfect without using any screw adjustment.
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Old April 27th, 2017, 10:13 AM   #80
 
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Originally Posted by arlanarneberg View Post
Got the new disconnector this morning and installed it. Works great now. Trigger pull is in the mid 2's.
Have you made a side-by-side compare of the disconnectors? I would be very curious to know what dimension changed that makes the difference.
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Old April 27th, 2017, 10:23 AM   #81
 
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Originally Posted by tiehshau View Post
Love this Ruger forum. My first post. Thought I'd share my upgrade experience with my M4 hunter. I installed a Mark iii Volquartzen sear, a Mark ii hammer and hammer bushing I had left over from a previous modification and a TK mark iv trigger, with the original disconnector. The only issue I have is the pre-travel of the trigger. If I lower it, the trigger won't reset. The trigger pull is in the 2-3 pound range ( no gauge ), and very crisp. Any thoughts on the pre-travel. The post-travel is perfect without using any screw adjustment.
A small amount of pre-travel is needed for reset. If you think you have too much, are you sure it's pre-travel and not creep? Creep is the sear movement after the disconnector engages the sear, but before the sear releases the hammer.

Also, it's possible you have some pre-creep. This is slop in the hammer bushing that must be taken up before the sear can start to move out of the hammer notch. I bought a used MKII that had a very worn bushing that induced a good bit of pre-creep. A new bushing fixed it right up.
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Old May 1st, 2017, 05:37 PM   #82
 
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mark iv

Thanks for the ideas. I don't think it's creep as there seems to be no resistance until I feel the trigger stop and then it fires with minimal pressure and travel. I did see that TK has a VK sear for the M4 so I ordered one. The pix of the M3 sear and M4 sear for use without the magazine disconnect do look different and it's the first I've seen the M4 sear sold separately without the hammer and trigger parts. I'll put it in and see if it makes a difference.
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Old May 6th, 2017, 11:14 AM   #83
 
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Originally Posted by tiehshau View Post
Love this Ruger forum. My first post. Thought I'd share my upgrade experience with my M4 hunter. I installed a Mark iii Volquartzen sear, a Mark ii hammer and hammer bushing I had left over from a previous modification and a TK mark iv trigger, with the original disconnector. The only issue I have is the pre-travel of the trigger. If I lower it, the trigger won't reset. The trigger pull is in the 2-3 pound range ( no gauge ), and very crisp. Any thoughts on the pre-travel. The post-travel is perfect without using any screw adjustment.
I bought a VQ mark iv sear from TK. Looking at the VQ M3 sear and the VQ m4, there is a slight difference. Installed the VQ M4 sear, kept the M2 hammer and bushing. I also filed down the front edges of the TK M4 trigger to match the rounding of the original Ruger trigger. I saw this on a video and it seemed logical as the front of the M4 trigger housing is somewhat rounded. RESULTS are fantastic. Pretravel is down to about 1/8" and the trigger pull is in the 2.5 lb range. Much more fun to shoot than with the original M4 parts
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Old May 9th, 2017, 03:38 PM   #84
 
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Was digging online and had to join this great forum based on this very topic alone.

I also have a Mark IV Hunter, and installed the Volquartsen kit, with the same issue. The hammer was jamming in a horizontal position and causing a horrible trigger feel and often not firing at all.

Upon further investigation, discovered that the hammer strut was jamming in the recess of the plunger and spring. I removed the sear and installed just the hammer, and was able to "cock" the hammer with no sear installed! lifting up on the hammer broke the jam free.

So, either the strut was riveted onto the hammer backwards or could use a little shaping to not catch itself on the edges of the plunger hole. I'll give Volquartsen a call to see if they have a solution.

Back to stock set up for now which works just fine.
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Old May 10th, 2017, 08:21 AM   #85
 
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Talked to Volquartsen today and not surprisingly, the answer was pretty much "Yeah. So you should reshape the hammer strut so that it works. Ruger has some production variances. Anything else?"

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Old May 10th, 2017, 10:38 AM   #86
 
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So if I understand you correctly, you're saying that the Ruger hammer doesn't stick at horizontal and the VQ hammer does? Does the VQ hammer come with it's own strut, or do you have to move the strut over from the Ruger hammer?

Please post some pics of the modified strut if you get it to work.
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Old May 10th, 2017, 02:23 PM   #87
 
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Correct. While trying to diagnose what's happening, I installed the factory Ruger hammer with no other parts (no sear, no trigger, no disconnector) and the factory hammer will not hang up just wants to spring forward. When I do the same with the Volquartsen hammer, even with no sear or other parts, it was jamming in the horizontal position.

I thought this was because the strut was grabbing in the plunger/hammer spring tube, and so gently shaped the strut edges round and polished. Same issue... further investigation shows that the Volquartsen hammer is capable of cocking further back than the Ruger one, effectively putting it past the pivot point so that the hammer spring is no longer pushing it up but holding it down.

I called Volquartsen again and their tech was insistent that their disconnector solves this. They wouldn't send me one though, I had to buy one for a retailer. I guess I'm stuck till it arrives... I'm skeptical that it will solve the issue.

I'll post pics later... for now, the bright side is that I feel like Mark 4 pro, I've had the full factory set up and full volquartsen set up in and out so many times I could probably do it blindfolded.
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Old May 10th, 2017, 09:57 PM   #88
 
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I tried installing the VQ Accurizing kit today in my MkIV 22/45 Lite. The install was straight forward and not difficult but it appears that I have the same issue with the disconnector as reported by several people. I've got a call in VQ to see what they say.
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Old May 11th, 2017, 03:43 AM   #89
 
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Quote:
Originally Posted by kilyung View Post
I tried installing the VQ Accurizing kit today in my MkIV 22/45 Lite. The install was straight forward and not difficult but it appears that I have the same issue with the disconnector as reported by several people. I've got a call in VQ to see what they say.
Let us know what they say. I have a VQ kit I have not installed yet and may send back.
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Old May 11th, 2017, 03:46 AM   #90
 
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Originally Posted by Kamunen View Post
Correct. While trying to diagnose what's happening, I installed the factory Ruger hammer with no other parts (no sear, no trigger, no disconnector) and the factory hammer will not hang up just wants to spring forward. When I do the same with the Volquartsen hammer, even with no sear or other parts, it was jamming in the horizontal position.

I thought this was because the strut was grabbing in the plunger/hammer spring tube, and so gently shaped the strut edges round and polished. Same issue... further investigation shows that the Volquartsen hammer is capable of cocking further back than the Ruger one, effectively putting it past the pivot point so that the hammer spring is no longer pushing it up but holding it down.

I called Volquartsen again and their tech was insistent that their disconnector solves this. They wouldn't send me one though, I had to buy one for a retailer. I guess I'm stuck till it arrives... I'm skeptical that it will solve the issue.

I'll post pics later... for now, the bright side is that I feel like Mark 4 pro, I've had the full factory set up and full volquartsen set up in and out so many times I could probably do it blindfolded.
When pushed all the way to horizontal both my factory and VQ hammer will hang and have to be pulled up to engage the sear. The hammer doesn't get pushed that far back when firing so I'm not understanding the issue or how a different disconnector will have anything to do with it. Just for grins I tried it with a VQ disconnector and there was no change.
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