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1st Timney trigger on M77 MKII

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  #1  
Unread 02-21-2014, 11:27 PM
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Join Date: Aug 2013
Location: Scroggins, TX
Posts: 63
1st Timney trigger on M77 MKII

I just installed my first Timney trigger. First to install and first to own. It went into a Ruger M77 MkII .300Win Mag. I expected to have to file the block for the safety, but it was way more involved than that. Maybe I got a bad one or maybe because it's an early '90s rifle... I don't know. First off, the trigger itself was too wide to fit into the slot in the receiver. It was too large by .009" which is huge when working with a fine file. I ended up using a dremel with a sanding drum. I kept checking the fit to make sure I didn't go too far. Next was the safety block on the trigger. I took nearly an 1/8" of material off with a file. It fits perfect but WOW, I never expected to remove so much.

Then it was the spring... No matter how heavy I adjusted the pull weight, I couldn't close the bolt without a slam fire. I finally used the factory spring. That did the trick. Overall it weighs in right at 1lb so I'm happy. I even ran the bolt over 100 times in a VIGOROUS manner and I can say that it won't slam fire.

Range testing will begin this weekend but I won't be so naieve about the Timney triggers again
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  •   #2  
    Unread 02-22-2014, 10:37 AM
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    Join Date: Mar 2010
    Location: on the Southern Plains
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    Re: 1st Timney trigger on M77 MKII

    Your experience with the installation on a Ruger was typical. Those issues are not typical when installing a Timney on a Remington, Mauser, Howa,,,, just to the Rugers, new model or old model. Occasionally, issues with safety engagement are encountered with installation of a Timney on Winchester70. That issue only exists sometimes with the Model 70, not all the time.
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    "Shoots real good!": definition; it didn't blow-up in my face. 1993 graduate Montgomery Community College 2yr. gunsmithing program
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      #3  
    Unread 02-22-2014, 11:29 AM
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    Join Date: Aug 2013
    Location: Scroggins, TX
    Posts: 63
    Re: 1st Timney trigger on M77 MKII

    I'm glad to know that problem isn't unique to me or my rifle. I'm glad I did it and I'd do it again, but it was a very tense project!
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      #4  
    Unread 02-22-2014, 01:24 PM
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    Join Date: Apr 2007
    Location: Fort Morgan, Colorado
    Posts: 401
    Re: 1st Timney trigger on M77 MKII

    My SIL and myself have installed Timney triggers in several MK II Ruger rifles and I have never had to remove that much stock material, and usually none at all. I don't know why the spring with the Timney trigger wouldn't let you adjust safely because every Timney I have installed had to be lightened a little after installation. Strange!
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      #5  
    Unread 02-26-2014, 07:48 PM
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    Join Date: Aug 2013
    Location: Scroggins, TX
    Posts: 63
    Re: 1st Timney trigger on M77 MKII

    So far, since the new trigger, I've got a new 208 amax load going. Getting just below 1/2" groups at 100yds on sandbags with 71.5g of H4831sc and WLRM primers. Should I stretch out the distance?...!
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