Ruger Mk III Loose Sight

Discussion in 'Semi-Auto Handguns' started by Mr. Bluesky, Dec 7, 2009.

  1. Mr. Bluesky

    Mr. Bluesky New Member

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    Cleaning my gun after being at the range, I noticed that the front sight was loose. I straightened it carefully, tightened the screw, and didn't think anything of it. Then it decided to come loose mid-mag on my most recent range trip, so I tightened it again. Then it kept getting looser and looser as I shot. I think it's something to do with the barrel expanding from the heat, but I have no idea what caused this to start happening all of a sudden. The gun has several thousand rounds through it, and it's only done this the past two times I've shot it.

    Has anyone else had this happen to them? Any idea how to solve it?
     
  2. NGIB

    NGIB New Member

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    Never had it happen to me but some red loctite will fix it up...
     

  3. m72law

    m72law New Member

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    mine has about the same amount of rounds through it...never had this prob before...front sight you say?...my front sight had a roll pin through the blade of the sight before i took it off and threw a red dot scope on it....if the screw is coming lose on you....get some blue loc-tite and put on the threads then run your screw back in & you should be good to go...:) but if it comes lose again...get some red loc-tite & do the same:D
     
  4. Mr. Bluesky

    Mr. Bluesky New Member

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    Is this something I'll be able to remove without damaging the finish if I need to remove the sight in the future?
     
  5. NGIB

    NGIB New Member

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    A little heat applied to the screw head will break the loctite grip. A small soldering iron works great for this...
     
  6. Mr. Bluesky

    Mr. Bluesky New Member

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    If applying heat loosens it up, how will it hold when the gun barrel gets hot? I'm not doubting you, just trying to get all the info before I goo up any part of my gun.
     
  7. NGIB

    NGIB New Member

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    I seriously doubt the barrel gets that hot even with prolonged and continued use. You asked a question, we provided answers - your choice whether to take the advice or not...
     
  8. cpttango30

    cpttango30 New Member

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    Dude how many rounds you shoot threw that thing? I have 5 mags and Had the kids loading once and I fired almost 500 rounds almost non stop and it didn't get that hot.

    I used blue locktite on my and it works like a champ. I have seen a bunch of the heavy barrel single screw sights come lose. They should have put in 2 screws. Blue lock tite it and you will be good to go and no need for heat to get the screw out.
     
  9. Highpower

    Highpower New Member

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    First of all -- you need to remove the screw and the sight from the gun then clean and dry the threads of the screw and the threaded hole in the barrel. You'll need to remove any trace of oil from the threads in order for the loc-tite to adhere properly. Acetone, brake cleaner, gun-scrubber, alcohol etc., will work as a de-greaser.

    And you won't "goo up" the gun because you are only going to use 1 drop of the blue (#242) loc-tite on each of the screws. Get the screws snug, but don't over do it. Believe me - the screws won't come loose again until you want them to. :)
     
  10. Mr. Bluesky

    Mr. Bluesky New Member

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    Awesome, thanks very much.
     
  11. Mr. Bluesky

    Mr. Bluesky New Member

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    Loctite was a no-go. Cleaned the gun, sight, and screw thoroughly, applied the stuff, put it back together and let it cure, everything was good, no give at all. Went out to the range, put 150 rounds through it, and it's loose again. Much less than before, because the screw does NOT move any more (i.e. the Loctite is doing what it's supposed to do, it's just not the whole problem), so I'm going back to my original theory of something going wrong when the barrel gets hot. It might be a manufacturer defect, so I'll call customer service today, but do you folks have any other ideas in the meantime?
     
  12. Armedoc

    Armedoc New Member

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    Same Problem

    Just wondering if you solved this issue by way of Customer Service.
    I picked this pistol up used in Novermber. On my third range trip I noticed my groups were way larger than normal & that the front sight loosened up. I I tightened it with a screwdriver but after a couple of mags it would loosen again. There is definitely red loctite as it appears to liquefy as the barrel heats up.

    What did Customer Service say?