Sako 85 barrel plug screws for iron sight mount holes

Discussion in 'General Sako Discussions' started by Montana Paul, Oct 11, 2017.

  1. Montana Paul

    Montana Paul Member

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    I recently bought a new Sako 85 Bavarian Carbine in 308. I am mounting a scope on it and want to remove the factory iron sights and need to plug the screw holes. Anybody know what size plug screws I need? I suspect they're metric.

     

  2. Bernie’s Dad

    Bernie’s Dad Well-Known Member

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    Paul I have the same issue. Did you ever find a good source?


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  3. mercerbear

    mercerbear Member

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    I am trying to plug 2 holes left after removing the rear sight from my L579. Did you ever figure out what size those plug screws are?

    I may try to find some brass plug screws that are a close size and deform them into the steel...
     
  4. lord frith

    lord frith Well-Known Member

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    Try 6-48.
    Stephen
     
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  5. tilleyman

    tilleyman Well-Known Member

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    Those screws are the same as the front sight ramp, a custom design in a fine pitch Metric thread M4 x 0.5mm x 4mm long.
    Non-standard item (of course) also shared with the Tikka M55...
    You really don't want them slightly too long, bottoming out when torqued up and potentially putting a dimple in the bore if used on the front sight ramp!
    Item #76 Mounting Screw Part No 3300779
    https://www.sako.fi/sites/default/files/Forester.pdf

    Very hard to find as loose set screws, you could always make some up using some 4mm drill rod and a M4x0.5 HSS die
    https://www.tracytools.com/taps-and-dies/metric-taps-dies/4-x-5-metric

    McMaster Carr don't list them but DO list a M3x0.5x10mm extended tip set screw which Sako used in the A and L series cocking piece to retain the firing pin.
    https://www.mcmaster.com/92905A603/

    Regarding the Sako 75/85 Midwest show them, not sure if in stock:
    https://www.midwestgunworks.com/sako-75/parts.html
     
    Last edited: Jul 25, 2021
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  6. Bernie’s Dad

    Bernie’s Dad Well-Known Member

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    Brownells had them too. I just got some.


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  7. mercerbear

    mercerbear Member

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    Regarding the M4x0.5 screws needed to plug the tapped holes in a L579, I searched the internet and found the following:

    Traxxas Screws, Set (grub) 4mm (6) (w/threadlock)

    They appear to be hobbiest screws. Maybe RC cars?

    I can't share the link because I haven't made 3 posts here yet.

    They were slightly too long, but I filed them down and they do fit into the plug holes.
     

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