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Loose screws on scope mount rail - Ruger mk II

Discussion in 'Maintenance & Gunsmithing' started by Dblugil, Oct 16, 2011.

  1. Dblugil

    Dblugil North Portland Oregon Member

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    I have a ruger mkII stainless model that the scope mount rail keeps comming loose after you fire 20-30 rds thru it. I can tighten them up and it does it again. I have used nail polish and loctite on screws going into receivers before and had 1 problem getting the screw back out. Given the size of the screws it doesnt take much to have a problem. Anybody else have the same issues or use something else???
     
  2. shayne

    shayne port townsend Active Member

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    ive had the same issue and used same fix
     
  3. halmbarte

    halmbarte PDX Active Member

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    How are you cleaning the screws and holes before using the loctite?

    H
     
  4. Dblugil

    Dblugil North Portland Oregon Member

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    rubbing alcohol and q-tips
     
  5. Straight Shooter

    Straight Shooter North Bend OR Active Member

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    What is the thread fit like? Are you using an inch pound torque wrench? What are you torquing them to? Loctite or not a fastener needs enough torgue to slightly stretch it and this tension is what actually holds it tight.
     
  6. Velzey

    Velzey Estacada, Oregon Gunsmith Gunsmith Bronze Vendor Bronze Supporter

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    Clean the holes and the screws with acetone, apply red loctite (stud type) and enjoy.....

    If you ever need to remove them, disassemble the upper and pour almost boiling hot water on the screws and the red loctite will break loose!
     
  7. Dblugil

    Dblugil North Portland Oregon Member

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    Thanks for the reply
     
  8. Gunner3456

    Gunner3456 Salem Well-Known Member

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    Exactly. And if you over tighten the screws, you can permanently over stretch them and ruin the metal. They'll never stay tight.
     
  9. Gunner3456

    Gunner3456 Salem Well-Known Member

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    One more time. Never rubbing alcohol. It has baby oil in it to replace the skin oils when used, and makes for a lousy cleaner. It's meant only for skin surfaces. Use acetone as Velzey said, or use denatured alcohol which you might have to ask the druggist for. It's still poison, LOL.
     
  10. Straight Shooter

    Straight Shooter North Bend OR Active Member

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    Overtorque the screws and it stretches them beyond their elastic range and deforms them in their plastic range. Overtightening can also fracture the threads in the receiver. "ruin the metal." That's why we use a torque wrench.