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    Trigger/Action Job on a gun with MIM parts question

    Question: Can a quality Action job be aquired on a revolver, (in this case I am talking about a 686 Plus), which has the "dreaded" MIM parts? I am not sure how MIM parts will take to stoning and polishing like real steel.

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    Re: Trigger/Action Job on a gun with MIM parts question

    I can tell you for a fact that the earliest MIM parts did not respond well to polishing.

    I cannot say how the most recent parts will hold up.
    ".... Evil Flourishes When Good Men Do Nothing...."

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    Re: Trigger/Action Job on a gun with MIM parts question

    Well this is an earlier version 686+. I think it is a dash 5 (I can't recall at my work desk) no lock, the first change into MIM parts.

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    Re: Trigger/Action Job on a gun with MIM parts question

    Were it me, I'd convert it to forged parts. You can do this if the firing pin is on the hammer. I did that to a very early, MIM Mountain Gun. Had to actually... the MIM parts went south when stoned and the trigger actually go worse.

    Here's a snapshot or two of that gun with the forged parts installed.





    With a 629 Mountain still in MIM.

    ".... Evil Flourishes When Good Men Do Nothing...."

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    Re: Trigger/Action Job on a gun with MIM parts question

    There is very little stoneing required on the MIM guns. The parts are nearly burr free. Even the frames are very flat and smooth.

    When polishing use a flat stone and go over the parts / frame to remove the high spots & burrs.
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    Re: Trigger/Action Job on a gun with MIM parts question

    Quote Originally Posted by 500 Magnum Nut
    There is very little stoneing required on the MIM guns. The parts are nearly burr free. Even the frames are very flat and smooth.

    When polishing use a flat stone and go over the parts / frame to remove the high spots & burrs.
    This kind of stuff I have done myself in the past on other revolvers (following a dvd from Jerry Miclek called S&W Trigger Job), but the MIM concerns me. So I'm guessing a professional Gunsmith isn't going to do a great deal better?

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    Re: Trigger/Action Job on a gun with MIM parts question

    MIM is just different steel, but it's steel never-the-less. It case hardened so a stone won't damage it.

    Wipe the parts with the stone, add a few drops of good oil, maybe change your springs and you will see a nicer action.

    Avoid the trigger or hammer hooks unless you are sure of what your doing.
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    Re: Trigger/Action Job on a gun with MIM parts question

    MIM parts are easier to work with. They are so close to the tolerances that they just take a little stoning to be where you want them. My MIM trigger jobs have lasted for years never having to worry about them.

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    Re: Trigger/Action Job on a gun with MIM parts question

    A drop of oil, applied to the right places, to reduce friction, might work. Bob
    When you want the BEST! Bob

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    Re: Trigger/Action Job on a gun with MIM parts question

    In my limited experience MIM parts can produce a very nice trigger pull. They tend to have a little more surface texture to them than the forged parts. When that is smoothed, and it doesn’t take too much work to do it, you have a very smooth, hard trigger component that for me has given a very nice, long lasting trigger.

    I also tend to replace the rebound spring with a lighter Wolff spring.


 

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