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Slide doesn't stay back after the last shot

Discussion in 'Gunsmithing' started by Veritas1911, Feb 12, 2010.

  1. Veritas1911


    Jan 24, 2010
    Newb here.

    Brought my brand-spanking new in box Glock 34 to the range. Ran the magazines that came with the pistol with 9mm factory loads. For each magazine, not one stayed locked back after the last shot. What could be the issue?
  2. Boxerglocker

    Boxerglocker Jacks #1 Fan

    Mar 6, 2003
    Lynnwood, WA
    Have you detail stripped the gun at all?
    What ammo where you using?
    Does this happen with any of the mags you use?

  3. Hackett


    Mar 24, 2009
    Houma, LA
    9mm isn't known for much in the way of limp wristing, and it likely wouldn't be so consistent, so ruling that out.

    The slide lock could be installed incorrectly: test my pushing up toward slide, when no mag in gun and it should snap back down.

    When you put an empty mag in the gun and pull back the slide, does it lock?

    Let's start here, and see where we get.
  4. ChrisJn

    ChrisJn "Old Bill"

    Dec 30, 2008
    Baldwin Co, Alabama
  5. Veritas1911


    Jan 24, 2010
    Have not detailed stripped, only field stripped and oiled.

    Used Federal American Eagle 9mm 115grn FMJ.

    Happened using the two Glock magazines that came with it.

  6. lethal tupperwa

    lethal tupperwa

    Aug 20, 2002
    If you retract the slide with an empty magazine it it does it stay back?
  7. Veritas1911


    Jan 24, 2010
    I typically shoot .45ACP in my 1911s. Limp wristing hasn't been an issue.

    The test you mention executes as you describe.

    When I put an empty mag in the and pull back the slide it does lock back.

    Thanks for your help.
  8. js415


    Feb 13, 2009
    Newnan, GA
    I believe you have the same problem I do, when I get in a hurry.

    Your thumb is hitting the slide lock lever, whether you realize it or not!!!

    Try a few shots, one handed, with just your left hand, and see what happens.

    I have to change my grip slightly when I go form the G19 to the G17.
  9. Veritas1911


    Jan 24, 2010
    By George I think you've got it!

    I'm a longtime 1911 shooter so I'm using the same grip on my G34 as I do using my 1911s which includes riding the thumb safety with my thumb. In the case of the G34, there isn't a thumb safety so I'm "naturally" riding the slide release with my thumb. And it appears it doesn't take much pressure to release that slide lock lever. DUH!

    Like I said, I'm a newb with the Glock. After much debate as to which first polymer to get, I chose the Glock 34.

    Thanks again!
    Last edited: Feb 13, 2010
  10. Bladegt


    Oct 4, 2007
    Spring Hill FL
    +1 on this. Sometimes when I shoot my Sig I do the same thing. It can be a pain when you aren't counting rounds off and you end up hearing that click and wonder what went wrong, only to relize you're outta ammo! :tongueout: Happens to everyone every now and then.
  11. pangloss9


    Mar 2, 2009
    middle TN
    Don't feel bad. I have a friend who almost sent his Kimber back to the factory because of some weak hand thumb problems.
  12. MSgt Dotson

    MSgt Dotson

    Sep 30, 2006
    It will cost you about $3 to have a shop that sells Glock parts to install a non-extended slide stop lever......

    I had to change my Glock 35's extended slide stop for a standard/non extended when my sausage thumb would apparently bump it upwards in times of competition 'stress'...multiple preemie lockbacks! BAD!

    (The 'slide lock lever' is used to disassemble the pistol, not stop/release the slide)
  13. vmann

    vmann Controller

    Jan 22, 2010
  14. Had the same problem with my G19, took it back to where I bought it and they sent it back to Glock, Glock sends it back saying nothing is wrong with it. The next day I'm getting ammo for it and I ask the sales person who I know is glock armor and he hands me one of those blue fake glocks and says ...let me see how your holding it, he looks, says your thumb is riding the release, just reposition your thumb ... so I did just that, and havent had a problem since. DUH
  15. Gibbles


    Oct 3, 2006
    I do the same thing, I have no issue with the .45acp frames but the 9mm and .40 frames my thumb works it's way up... :whistling:

    When I first had the problem I thought my gun was messed up, so before calling glock I took it to a local glock smith and had him check it out. :embarassed:
  16. I'm a lefty so it's a complete non issue for me. I've gotten so used to using my trigger finger to activate the slide release lever as well as the magazine release over the years that it's natural for me to shoot all my guns without any modifications. Back when I shot 1911's a lot, I would put in an ambi safety, but that's it.

    I would have never thought about the thumb issue though. Good thinking guys.
  17. Glockrunner

    Glockrunner HOOYA DEEPSEA

    Sep 10, 2001
    We don't have anyway to tell on the net exactly what is causing your problem and as you see it could be any number of things.

    First off, is this a brand new out of the box gun or, are you buying a previously owned gun?

    A few things come to mind.

    Worn SLIDE STOP LEVER notch.
    You may have a dirty magazine or;
    broken magazine follower

    May be time for new magazine springs anyway unless the gun is brand new.

    Check too and see if the Trigger Pin is pushed too far in one direction or the other.

    Be sure to clean and lube the gun as per the owners manual too.

    I personally won't shoot American Eagle ammo if it says on the container that the bullets are WASHED in copper. You'll get a lot of lead fouling and could damage the gun. IF YOU SEE SIGNS OF LEAD build up STOP using that ammo and get the bore cleaned out to the best of your ability.

    As mentioned earlier your shooting style, the way you hold the gun can also cause this effect as well as under powered ammo.
    Last edited: Jul 7, 2010
  18. MSgt Dotson

    MSgt Dotson

    Sep 30, 2006
    The slide lock (extends out both sides of pistol) is used for disassembly only...

    The slide stop lever is likely what you are referring to...

    In any event, it might cause confusion for someone to refer to the parts incorrectly....
  19. Bren

    Bren NRA Life Member

    Jan 16, 2005
    The usual one is your grip - one of your thumbs is most likely holding down the sldie stop lever when you shoot.