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Thread: Sako M591 cocking/safety catch problem

  1. #1

    Sako M591 cocking/safety catch problem

    My M591 in .243 has a problem. On a couple of occasions the rifle has refused to cock then last night I found that when cocked the safety would not engage.
    The rifle is now OTR pending repair.
    Anyone come across this problem before?

  2. #2
    Take the trigger group off and wash in white spirit, dry and lightly lubricate. Worth a try.

  3. #3
    It's set too light. Increase the trigger weight a little at a time until the safety is reliable. But, also give it a good clean first.
    Sako TRG-42 folder .338LM🔫 Sako TRG-22 .308/.260🔫 Tikka 595 .222(NV'd up) 🔫 AR15 .223/300BLK 🔫Franchi 12g 520 9shot🔫Baikal .410 stealth🔫Ruger #1.243

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  4. #4
    I would not do that (wash in white spirit) as some parts in the trigger assembly need lubrication and you have not identiifed the fault.
    Experiment by cycling the bolt with the stock removed to identify the fault.
    You could ask the question on sako collectors club. They are interested in the models prior to the M591 but I think the trigger is the same as the A1/ A2.
    There are parts diagrams on the sako web site.
    You don't say what specifically fails each time, does the trigger not cock when you lock the bolt down?
    And when the safety does not engage I assume the button is pulled back but nothing locks the trigger?
    Last edited by jack; 10-05-2014 at 15:30.

  5. #5
    On the first occasion the trigger did not cock. The cocked indicator was not visible at the rear of the bolt. It took several cycles to get the trigger cocked. Since then it has only happened whilst dry cycling quickly.
    Last night when chambered, it was showing as cocked but would not let me activate the safety catch. I cycled the next round up and the safety was able to move to safe however the same thing happened a couple of cycles later. Both problems will not happen every time, only intermittently. I did not try the trigger as the safety would not move all the way back so I considered it to be "not safe" as in ready to fire. Hope this helps.

  6. #6

    Sako M591 cocking/safety catch problem

    Yep. That's set too light. I have several Tikkas/sakos, that I set so they were all the same for consistency, but one would do this until set a little higher, it was at 14oz but now around 18oz, so I've now set them all at that. Too light means the sear either won't engage, or partially engages, allowing it to cock, but won't allow the safety selector to engage. You may find it's worse when cold as any lube is thicker so slowing it down in use.

    Sako TRG-42 folder .338LM🔫 Sako TRG-22 .308/.260🔫 Tikka 595 .222(NV'd up) 🔫 AR15 .223/300BLK 🔫Franchi 12g 520 9shot🔫Baikal .410 stealth🔫Ruger #1.243

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  7. #7
    Quote Originally Posted by dodgyrog View Post
    Take the trigger group off and wash in white spirit, dry and lightly lubricate. Worth a try.
    That is exactly what I would do, and when dodgyrog says lightly lubricate do exactly that. More problems are caused by over lubrication than by under lubrication. The Tramp is also probably correct in that the sear engagement may have worn slightly over the years and needs adjusting to ensure adequate engagement. If you don't feel competent to simply adjust the trigger using the makers instructions or feel unsure in any way then go to a gunsmith (not a RFD a gunsmith).
    It's the calibre of the shooter that counts not the calibre of the rifle.

  8. #8
    Some say that a wash out with lighter fluid is the way to go - cleans & very lightly lubricates leaving no sticky oil. Just be sure to blow it off with compressed air at low pressure to ensure it is dry inside.
    Worth research methinks.


  9. #9
    Trigger groups should not require any lubrication
    Corrosion protection is not the same

    cocking piece to sear surface should be clean and dry

    grease/oil etc attracts dust, grit and foreign bodies, with tight tolerances and features that require fine surface to surface contact it is inviting trouble

    You technically can't "cock" a trigger
    The "cocking piece" is in the bolt.
    The trigger is allowing the bolt to remain cocked and if it is not doing so the release spring pressure would be my first port of call

    the mechanism is not complex and benefits from a full strip down and reassembly, cleaning each component.
    failing that an US bath and air dry (PC cleaner cans are just as good if a compressor is not available)

    rinsing in alcohol is fine if you can remove all the alcohol and all the foreign bodies, often you can wash fine bits deeper into the mechanism though
    If in doubt strip it

  10. #10
    It does not sound Like the trigger weight, but the sear engagement. Two separate adjustments.
    If cleaning, use 2 stroke petrol and compressed air. The petrol cleans and leaves a very slight oily residue.

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