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Old 11-16-2012, 12:25   #1
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Glock Scratch, Machine Mark, or Crack?

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!
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Old 11-16-2012, 12:35   #2
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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.


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Old 11-16-2012, 12:37   #3
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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 by mongo356; 11-16-2012 at 12:37..
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Old 11-16-2012, 12:43   #4
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Difficult to tell from the photos but my guess is also machine marks.
I never talked to anyone who had to fire their gun who said "I wished I had the smaller gun and fewer rounds with me" Just because you find a hundred people who agree with you on the internet does not mean you're right.
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Old 11-16-2012, 12:49   #5
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That line extends back to the rear as well. I'd say it's machining marks.
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Old 11-16-2012, 12:50   #6
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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.

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Old 11-16-2012, 13:05   #7
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Put me down for it being a machine mark as well...
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Old 11-16-2012, 13:55   #8
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Op take it to a machine shop and have it magnafluxed. or get a replacement barrel.
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Old 11-16-2012, 14:28   #9
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Machine mark or scratch, but does not look like a crack to me. I wouldn't loose any sleep over it at all. TXPO
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barrel, broken, crack, lug, scratch
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