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Timney triggers: how to reduce trigger pull?

This is a discussion on Timney triggers: how to reduce trigger pull? within the Gunsmithing forums, part of the Firearm Forum category; I installed a Timney Trigger group in my 10/22 80% receiver from Tactical Inc. It reduced my trigger pull down to @ 3 pounds and ...


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Old March 15th, 2017, 05:43 AM   #1
 
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Timney triggers: how to reduce trigger pull?

I installed a Timney Trigger group in my 10/22 80% receiver from Tactical Inc. It reduced my trigger pull down to @ 3 pounds and I want closer to two. Today, I pulled her apart and was not only impressed, but perplexed. The whole trigger/sear relationship has been re-engineered. I like it, and I don't. Why don't I like it? I'm not sure how to reduce trigger pull at this point. Usually, one would polish the hammer/sear interface as well as the disconnect/sear interface. I can do that, but I'm wondering if that's the best approach. Unlike a normal trigger, the sear and trigger are married and there is a set screw that seems to hold them both together.

Anyone know what the set screw adjusts? I'm thinking it could be either the trigger pull (cool), the tension on the disconnect (useless for my purposes and my best guess) or a combination of both. Anyone else try to deal with this?

On an aside, I'm pretty impressed with everything on this Timney trigger. The pins are a press fit and pretty tight. I might just re-assemble this as is, get a metal housing and redo one of the stock triggers to get down to my desired trigger pull.




Last edited by NetDoc; March 15th, 2017 at 09:53 AM.
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Old March 15th, 2017, 08:49 AM   #2
 
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For those interested, here are some pics...






Notice the new and improved hammer spring??? I thought I had dropped the push spring, but no. It's just not there. It took me less than five minutes to reassemble it. The only trick is that you have to slightly depress the trigger when putting the hammer pin in. The spring for the bolt retainer/release was a tad tricky, but it was't too bad, either. All in all, it's far easier to put back together than the standard trigger assembly.

Last edited by NetDoc; March 15th, 2017 at 08:58 AM.
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Old March 15th, 2017, 10:08 AM   #3
 
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Timney or Volquartsen? You mention both. And did you contact the manufacturer for help?

AFAIK, the Timney has no adjustment so you really can't lower trigger pull easily. You might need to switch your trigger choice.

Jeff

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Old March 15th, 2017, 10:44 AM   #4
 
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A Timney trigger for a 10/22 is not adjustable........its set at 2.75lb.



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Old March 15th, 2017, 12:24 PM   #5
 
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Quote:
Originally Posted by weaselfire View Post
Timney or Volquartsen?
Timney. I inadvertently had Volquartsen in the title. They've corrected that for me. I actually have Volquartsen innards ordered for my Mark IV Hunter. Sorry for the confusion.

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Originally Posted by weaselfire View Post
AFAIK, the Timney has no adjustment so you really can't lower trigger pull easily.
Few triggers have an 'adjustment'. However, as long as there's a hammer/sear interface, they can be polished and modded. Not much to work with here, so I have to be careful. They have drilled and chamfered an inspection port right at the sear/disconnector interface. It's cool to see how they work IRT. It would be easy to make this full auto.

I was rather amazed at how much pressure it takes to simply overcome the pressure of the trigger spring. I should have measured just that when I had it apart. That's one stiff spring.
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Old March 15th, 2017, 12:35 PM   #6
 
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Quote:
Originally Posted by NetDoc View Post
Timney. I inadvertently had Volquartsen in the title. They've corrected that for me. I actually have Volquartsen innards ordered for my Mark IV Hunter. Sorry for the confusion.

Few triggers have an 'adjustment'. However, as long as there's a hammer/sear interface, they can be polished and modded. Not much to work with here, so I have to be careful. They have drilled and chamfered an inspection port right at the sear/disconnector interface. It's cool to see how they work IRT. It would be easy to make this full auto.

I was rather amazed at how much pressure it takes to simply overcome the pressure of the trigger spring. I should have measured just that when I had it apart. That's one stiff spring.
Sounds like someone is going to do some "garage gunsmithing"......good luck.



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Old March 15th, 2017, 01:43 PM   #7
 
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Quote:
Originally Posted by Mark204 View Post
Sounds like someone is going to do some "garage gunsmithing"......good luck.



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Also sounds like someone might be buying another trigger if everything doesn't go well.
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Old March 15th, 2017, 01:44 PM   #8
 
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Quote:
Originally Posted by gwpercle View Post
Also sounds like someone might be buying another trigger if everything doesn't go well.
I was kind a leaning that way too.



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Old March 15th, 2017, 01:47 PM   #9
 
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Quote:
Originally Posted by Mark204 View Post
Sounds like someone is going to do some "garage gunsmithing"......good luck.
As an apprentice in the UF Chemistry machine shop learned to measure a dozen times before you make the first cut. I also learned that good machinists make very few mistakes, but great machinists know how to cover them up and it's the very last cut that ruins the job. Consequently, I don't make a move before I fully understand the mechanisms. Forums can give a lot of insight, and but can also get a lot of "don't do it"s without them ever telling you why. Usually, it's because they haven't sussed it out yet, either. Hmnnnn...

I just took the trigger assembly apart to measure the pressure exerted by the trigger spring (between the back of the trigger and the trigger guard). It's at 2+ pounds by itself! WOW!!! Don't think I'll be touching the sear/hammer interface. Most of the pressure is right in that spring. I would not have guessed that.

I already have a different trigger coming, although it's obvious that it won't work with these parts. So... I ordered an aluminum billet trigger housing so I can take the innards out of the plastic trigger group and play with that. I wonder if I can find trigger springs in different tensions.

Last edited by NetDoc; March 15th, 2017 at 02:13 PM.
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Old March 15th, 2017, 02:10 PM   #10
 
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Quote:
Originally Posted by NetDoc View Post
I wonder if I can find trigger springs in different tensions.
Apparently I can, and I have ordered them: KIDD Pull Weight Tuning Spring Kit for a 10/22® or Ruger® 10/22® | eBay

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Old March 15th, 2017, 07:27 PM   #11
 
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have you tried internet search ?

phrase like - timney trigger adjustment - returns lots of links browse thru them and likely somebody will have answered that question ?
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Old March 16th, 2017, 02:45 AM   #12
 
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I did, but there's very little info about it. I should have spent the money and bought a two stage Kidd. The problem is definitely in the trigger spring.

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Old March 16th, 2017, 06:09 AM   #13
 
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OK, I found a solution to my heavy trigger pull... at least I think I have. I won't be modifying the Timney Trigger assembly, except to try a Kidd trigger return spring. We'll see if that helps get me closer to 2 pounds. I do love their feel, but I want a very sensitive range trigger.

I saw a video last week and had actually ordered the Brimstone Trigger blade, thinking it would go into my Timney. I don't think it will due to interference with Timney's redesign of their trigger spring (no spring strut). So now, I'm going to sacrifice the insides of a BX trigger group, polish the sear/hammer interface as well as the disconnect/hammer interface and install that with Brimstone's trigger blade in a billet aluminum housing I have coming. I think I'll have all these parts delivered by Monday, so hopefully I'll be able to play with it. I guess I could order the trigger insides from someone like Volquartsen, and I might still do that rather than gut the BX group. It should be fun!

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