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G23 Breach Face...should I be concerned?

Discussion in 'Gunsmithing' started by art g, Oct 11, 2010.

  1. art g

    art g

    286
    0
    Feb 5, 2001
    SC
    Just picked up a very nice Generation 2 Glock 23. Pistol is in like new condition except the breach face is covered in what appears to be some kind of tool marks... or? Should I be concerned about this or just fire away and forget it? Have owned many Glocks but never have I run in to anything like this. Any advice would be appreciated. Below is a pic Thank you, artgsc@aol.com
    [​IMG]
     
    Last edited: Oct 11, 2010
  2. wcmaas

    wcmaas Spares Weenie Silver Member

    152
    0
    May 4, 2005
    The OC, DPR Kalifornia
    I've got some that look like that too. Wondered the same thing as you. Doesn't seem to make any difference - they all shoot fine and are boring reliable.
     


  3. Brian Lee

    Brian Lee Drop those nuts

    9,539
    427
    Jul 28, 2008
    Up a tree.
    I'm a machinist among other things, and that does not look like any kind of original machining marks to me at all.

    My guess is that the back end of the barrel has been rubbing the breech face pretty hard and making this happen. This is the kind of galling action that occurs in industrial tooling whenever you have two metal parts rubbing hard with little or no lubrication, and with no difference in the hardness of the two metal parts. Whenever two steel parts are about the same hardness, however hard or soft that is, this is the kind of marks that result from rubbing them together too hard. Making one part of a metal that is significantly harder than the other generally stops it from happening.

    I had always assumed that Glock would make the breech face and the barrel at different hardness's to prevent this problem, but maybe not. It could also be that an aftermarket barrel was used which had a hardness matching that of the breech.

    It isn't normal at all, but it looks to have kept itself worn down fairly smooth as it went, so if the barrel seems to lock up tight, it's probably OK to shoot. Check the back end of the barrel for similar marks, and maybe smooth both surfaces with a nice flat stone, not a file.
     
  4. Paul_J

    Paul_J

    1,621
    1
    Nov 19, 2008
    Houston, Texas
    I just pulled my 23 apart and inserted a dummy round into the barrel and slide like it would during a normal cycle. The back end of the barrel doesn't make contact with that area of the breach face but the back of the case does and as the case is loaded it slides up underneath the extractor. Maybe the end of the brass case is galling on the breach face a little bit. Mine has about 2400 rounds and it shows very little wear.

    Edit, Mine is not real smooth and shows some faint tooling marks.
     
    Last edited: Oct 12, 2010
  5. I don't think brass would do that to a Glock Slide.
    The Glock slides are very hard so it has to be a like metal that is equally hard.
    Like the barrel.
     
  6. art g

    art g

    286
    0
    Feb 5, 2001
    SC
    I appreciate the input from those who have posted. I am going to try and talk with someone at Glock and see if they would be willing to give an opinion as well. artgsc@aol.com
     
  7. LT642

    LT642

    610
    3
    Oct 19, 2008
    art g, We've been using the G23 for many years, most, if not all, of our pistols look this way after a awhile. For piece of mind, call Glock, ask for Fred, and talk with him, you could also e mail him the picture to take a look at.
     
  8. TakeDeadAim

    TakeDeadAim

    6
    0
    Jan 17, 2010
    with it being all shiny silver like that I suspect someone at minimum "polished it" I have never seen a Glock wear across the entire surface in my experience. Some finish wear with extensive use is to be expected but not across the entire surface especially all the way at the top where nothing comes in contact with it. The barrel does not rub against the breach face the only wear would be from brass and the tenifer finish holds up to brass pretty well. I have seen people polish this surface thinking it will help make the gun feed better, (it does help on a 1911) but I am not sure it is needed on a Glock. I dont recall seeing many if any that were that rough from the factory so I would be interested in what they have to say.

    TakeDeadAim
    Glock Certified Armour
     
  9. repoman1984

    repoman1984 under the pully

    721
    0
    Oct 28, 2008
    Los Angeles

    Thats my best guess although the rockwell (hardness) on the cases isn't even in the same ballpark as a glock slide. its probably rubbed in and deposited as opposed to removed materials. Hit it with a brass brush see what happens but I dont see it as a problem.
     
  10. minkis18

    minkis18

    272
    0
    Aug 17, 2009
    Mesa, AZ
    It looks like your biggest problem might be trying to clean all the grime out of that thing! My glock has unknown thousands of rounds thru it and the ONLY marks on the breach face is a circular pattern from the cases. Likely just brass buildup.

    If I were to polish my breach face (which I just did some on my pre-owned ke-tec as well as other surfaces around there) it would just be to ease cleaning. I had the locking lugs polished on one of my other guns and it made it so all I had to do what wipe it off with a patch to make it shine.
     
  11. art g

    art g

    286
    0
    Feb 5, 2001
    SC
    I boxed up the slide and sent it to Glock. Asked for repair or replacement on my dime. Will post results when I know more. Except for the weird breach face this gun came to me in otherwise what appears to be unfired condition. Thanks for the all info posted in response to my inquiry here. I appreciate it! artgsc@aol.com
     
  12. arlessinfl

    arlessinfl

    78
    0
    Oct 15, 2004
    A couple of my older glocks look like this too. I do not think that it is unusual...but I would like to hear what the OP hears from Glock!
     
  13. captdreifus

    captdreifus aSun666

    1,593
    0
    Jul 24, 2008
    Tempe, Arizona
    I just bought a used 23 gen2 as well. Mine has tooling marks as well like the picture described. Have you tried shooting it before shipping to Glock? How much did they say it would cost to replace the slide?

    Thanks,
    capt
     
  14. *Paladin*

    *Paladin* Will travel....

    116
    0
    Mar 12, 2009
    Southern Utah
    My old G19's breechface looked like that from day 1. Wasn't ever a problem.
     
  15. NYStatePD

    NYStatePD Troop F

    90
    0
    Jan 11, 2008
    NY
    Same marks on my 13 year old G19.

    I call it "The Matrix":supergrin:
     
  16. art g

    art g

    286
    0
    Feb 5, 2001
    SC
    I have seen a couple of other Glocks now that have the same marks (not quite as pronounced as mine) so it is apparent that this must have been somewhat typical on the older guns. Even though my original slide is fine I still decided to get a new blind marked Lonewolf slide and then sent it to Robar for NP3. Installed steel sights, extended slide release, titanium pin kit, grip plug, 3# connector and finally a Crimson Trace laser which CDNN has on sale right now for $149. Turned out to be a fun project and the gun shoots well. Art G.
     
    Last edited: Nov 25, 2010
  17. arlessinfl

    arlessinfl

    78
    0
    Oct 15, 2004
  18. art g

    art g

    286
    0
    Feb 5, 2001
    SC
    I have not heard anything back from Glock yet but will give them a call next week and check in with them. I mailed the slide to Smyrna with a very polite note indicating that I felt the "tool marks" on the slide were excessive in my opinion and I would like a repair or replacement. Also, said I would be willing to pay a reasonable amount for this correction but would need to be contacted with a price. My delivery confirmation receipt says that they received the slide on November 1st. In the meantime, I decided to go ahead and invest some money in this gun as otherwise it is like new and below is a picture. I am very pleased with the new Crimson Trace from CDNN for $149 as I think that was an excellent deal. I bought this style a few years ago for around $250 for a Glock 19 but traded them off soon after as I could not stand that there was no master on-off switch. Now, with my 56 year old eyes I haven't seen a sharp front sight in quite some time so for $149 I can live with the all the time laser. Hope everyone has a great Thanksgiving! art g artgsc@aol.com
    [​IMG]
     
    Last edited: Nov 25, 2010
  19. Wriggly

    Wriggly

    210
    0
    May 1, 2010
    Illinois
    I would be curious to hear what Glock has to say, and what they do to fix your problem. I suspect a new slide will be in the works, because that looks like galling to me, and it should not be occurring with contact from brass and soft steel or aluminum cases. It would indicate a defect from non hardened steel.