Ruger semi-auto locked open

Discussion in 'Technical Questions & Information' started by Kiltman, Oct 2, 2012.

  1. Kiltman

    Kiltman New Member

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    West Michigan
    Hello and hope someone can help.
    I have an early .44 mag. Ruger carbine. It is in super shape but the slide locked open when I shot it. It wasn't the last round. I managed to get it taken down and freed the slide so it worked. I didn't bend or pry anything.
    I pulled the slide open and it locked open again. It will not go shut when I depress the under button. I believe I was using pistol ammo in this older version. Is this repairable by a gunsmith?
    I already know the factory no longer has parts per inquiry with Ruger customer service.
  2. Helix_FR

    Helix_FR New Member

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    I had one in the shop that did that same thing. It escapes me exactly what the issue was but it was repairable wo even replacing anything.
  3. Kiltman

    Kiltman New Member

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    I looked up the serial number and mine was manufactured in 1980.
    I'll tear it down and look again to see if there are any areas that need to be deburred on the back of the bolt.
    thanks for your reply
  4. JLA

    JLA Well-Known Member

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    Sounds like the hold open is tripping without the mag follower hitting it.
  5. Helix_FR

    Helix_FR New Member

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    The ruger carbine runs much like a semi auto shot gun. (think Rem 11-87) its tube fed. When the gun fires, the bolt carrier moves the cartridge stop and the next round loads on to the carrier (or lifter) at the back of the carrier is a trip lever that allows the carrier unlock and move upwards and the bolt to move forward. If no round is in the tube then the trip lever is never hit and the bolt stays back bc the carrier stays down and it intercepts a notch in the bolt holding it in place. The one I fixed a while back was a bad cartridge stop timing. i the cartridge stop was interfering with the feed of the next round, slowing it down. Broken mag tube spring could also be a problem. If its weak it wont feed the next round with enough force to hit the trip lever nor fully feed the round to the carrier. The final thing could be trip lever is bound to the carrier for some reason and does not break away easily. The gun is easy to strip but repair of the trigger group and the timing can be rather tricky
    Last edited: Oct 4, 2012
  6. BETH

    BETH Well-Known Member

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    everyone always tell me on here clean it then see what happens
  7. Helix_FR

    Helix_FR New Member

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    many times thats the case. the ruger carbine was never real sensitive to being dirty. Gas piston was about it but it would cause a cycle issue. :D
  8. Kiltman

    Kiltman New Member

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    Location:
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    Thank-you All for your comments...I have discovered the culprit. I looked into the lifter mechanism. What I discovered was the lifter latch has a pin other than the hinge pin that keeps the lifter from moving until you depress the lifter latch to load it or the gun fires.
    This pin had slid all the way to one side keeping the lifter from operating (couldn't feed next shell). The gun thought it was in the "last round mode". It appears to be a simple fix if I can tighten the pin in the lifter latch......any suggestions?
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