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Glock Scratch, Machine Mark, or Crack?

Discussion in 'General Glocking' started by hhjosef, Nov 16, 2012.

  1. hhjosef


    Aug 17, 2010
    Hello fellow Glock owners, I have purchased a gen 2 17 upper for my gen 3 22 and upon inspection noticed there are these deep lines that appear to resemble hairline cracks at the lug of the barrel. My G22 is fairly new and there are no marks when compared, but I suspect the finish on the gen 3 may also be a bit superior. There is one specific one at a stress point that won't go away despite scratching at it. This concerns me as the serial dates the barrel to 1992, which means it may have been through a lot and I am afraid the lug will break off. I am so paranoid about this that I have taken sand paper against it and it has become less visible, but is still there. My question is, is this mark a scratch created from the locking block from normal use, a machine mark from the factory during manufacture, or a crack due to stress? Do your gen 2 glocks have similar marks? Attached are a few pics, thanks for any insight!

    Attached Files:

  2. gwdex


    Mar 12, 2010
    Rhode Island
    You might want to have the barrel inspected using a wet fluorescent magnetic particle test. This nondestructive inspection procedure is used to detect surface and slightly sub-surface cracking in ferrous components.


    P220 Carry
    P226 Navy

  3. mongo356


    Aug 18, 2004
    Without seeing it in person, I would say a machining mark.

    Many of the old guns look like they where chiseled out with a hammer & punch.

    Try and Google some images of older breechface Glocks they are rough, no problems mechanically but looked rough.

    Again just a guess..........
    Last edited: Nov 16, 2012
  4. Bruce M

    Bruce M

    Jan 3, 2010
    S FL
    Difficult to tell from the photos but my guess is also machine marks.
  5. Genin

    Genin Designated Left

    Oct 25, 2010
    Bloomsburg PA
    That line extends back to the rear as well. I'd say it's machining marks.
  6. JGlockman


    Oct 17, 2011
    If you're worried, go to a local automotive machine shop, throw the machinist a $20 (or a case of beer), and ask him to magnaflux it.

    Sent from my SAMSUNG-SGH-I747 using Tapatalk 2
  7. plouffedaddy


    Apr 1, 2011
    Put me down for it being a machine mark as well...
  8. Remington 870

    Remington 870

    Feb 29, 2012
    Op take it to a machine shop and have it magnafluxed. or get a replacement barrel.
  9. TexasPOff

    TexasPOff "Dump The Hump"

    Machine mark or scratch, but does not look like a crack to me. I wouldn't loose any sleep over it at all. TXPO
    Last edited: Nov 16, 2012