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2 pin vs 3 pin

Discussion in 'Glock Collector's Club' started by Sean R, Sep 23, 2011.

  1. Sean R

    Sean R

    Aug 7, 2011
    Glocktown MA

    I keep hearing how 2nd Gen Glocks have 2 pin frames however I have a 2nd Gen G20 with three pins in the frame. I've also seen some other 2nd Gen G19s with 3 pins. Did Glock update the frames towards the last run of the 2nd Gens?

    Thanks Sean

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  2. I have a gen 2 model 22 and it is a 3 pin from what I have heard and read the .40sw with the 2 pin was cracking the frames so they started making them with 3 pins

  3. Sean R

    Sean R

    Aug 7, 2011
    Glocktown MA
    I see good info so we must have the later model 2nd Gens

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  4. They must have because here is my 2 gen G20... three pins...
    Last edited: Dec 25, 2011
  5. shadow_dog

    shadow_dog Hilljack

    Mar 6, 2004
    SW Ohio
  6. lasmacgod


    Dec 21, 2004
    Ditto. CMK prefix
  7. RandySmith


    Mar 1, 2001
    Staunton, Va.
    The 3rd pin came into being when the .40 was released. It had nothing to do with the "generation" of the frame.

  8. MakeMineA10mm

    MakeMineA10mm * * * * Millennium Member Lifetime Member

    Feb 13, 1999
    Central Illinois
    The third pin actually came about because of the 10mm G20. The recoil impulse at the locking block was causing the plastic to stretch and the locking block was rotating around that single forward pin resulting in the forward legs of the block to move up and hit the bottom of the barrel and slide, leading to jams. This all happened in development so there are NO 2-pin G20s. The G21 came out simultaneously with the G20, and for commonality, they made all the G21s also 3-pin.

    The G22 had come out just a year or two before the G20, and the very early G22s have 2-pin frames. A similar recoil-impulse/locking block rocking problem developed with the 40s&w in the small frame, so Glock quickly modified the G22 design to the 3-pin style.

    Eventually, the G18 also got this treatment and I believe the G26 started out with 3-pin frames, and then Glock decided, again for commonality/one production standard for all frames, that all the 9mms would be built on 3-pin frames. Not sure of the year on that, but it was much later than the G20/21/22/23 3-pin frames.

    At least, this is how I remember it... I do not recall if there are 2-pin G23s, but I believe there are.

    Randy is very correct that generation has nothing to do with # of pins, other than the very broad generalization that all Gen1s are 2-pin and all gen4s are 3-pin...
    Last edited: Dec 30, 2011
  9. Dogman 10x

    Dogman 10x

    Oct 10, 2004
    Is one type better then the other?
  10. clarkz71


    Aug 24, 2012
    South Florida
    Yes, 3rd pin is for the locking block, the most stressed part.