Quantcast
  1. Upgrade efforts paused for now. Thanks for your patience. More details in the thread in Tech Support for those who are interested.
    Dismiss Notice

Cetme C barrel broke out of trunnion after 150 rounds!

Discussion in 'Rifle Country' started by Puddinhead, Jun 1, 2022.

  1. Carl N. Brown

    Carl N. Brown Member

    Joined:
    May 10, 2005
    Messages:
    10,165
    Location:
    Kingsport Tennessee
    The Spanish issue ammo for the CETME was downloaded for control of the gun when fired full auto.

    Same reason as the 6.5 Arisaka rounds for their squad level light machine gun were lower power than the rifle issue 6.5 Ariska.

    Not because the select fire guns were too fragile, but because downloaded ammo made them more controllable under full auto.
     
    LoonWulf and MarshallDodge like this.
  2. Insignificant bill

    Insignificant bill Member

    Joined:
    May 2, 2019
    Messages:
    1,016
    I would think properly pressing the barrel and installing the pin would be the proper way to do it. But then I see other people talking about welding it. Is there a difference in the trunnions used?
     
    LoonWulf likes this.
  3. Holescreek

    Holescreek Member

    Joined:
    Apr 23, 2015
    Messages:
    109
    Location:
    SW Ohio
    The barrel is never welded into the trunnion on any Cetme/HK build. Barrels are pressed and pinned then the trunnion is welded into the receiver. In a dozen years of building these guns I've only ever seen one home gunsmith welded a barrel to a trunnion.
     
  4. arsterling180

    arsterling180 Member

    Joined:
    Jan 18, 2022
    Messages:
    114
    No. It’s ignorance of how G3s and Cetmes are built.
     
  5. Bcwitt

    Bcwitt Member

    Joined:
    Dec 22, 2020
    Messages:
    1,238
    Location:
    Pennsylvania
    Come to think of it, ive never seen one knurled before.
     
    BigBlue 94 likes this.
  6. BigBlue 94

    BigBlue 94 Member

    Joined:
    Dec 5, 2018
    Messages:
    3,342
    Location:
    The Great American Prairie
    Ive only seen one cetme, my CAI C308. And couldnt say if it was knurled or not. But i did think to myself that it looked out of place. I even went as far as to critique the knurl itself: its not the worst ive seen. My first couple tries were, uh, pretty poor...
     
    Bcwitt likes this.
  7. Bcwitt

    Bcwitt Member

    Joined:
    Dec 22, 2020
    Messages:
    1,238
    Location:
    Pennsylvania
    I had that same rifle. Was a decent shooter.
     
  8. BigBlue 94

    BigBlue 94 Member

    Joined:
    Dec 5, 2018
    Messages:
    3,342
    Location:
    The Great American Prairie
    Mine runs great! Just needs to be well oiled. I just put a set of refinished surplus wood furniture on in place of the plastic.
     
    Ignition Override and Bcwitt like this.
  9. GBExpat

    GBExpat Member

    Joined:
    Nov 5, 2007
    Messages:
    7,026
    Location:
    Rural, far beyond the beltway, Northern Virginia,
    I bought one, each, of the original Century CETME C S/A Variant rifles w/cast s/s receiver (Nov'01) and the next edition with stamped steel rcvr (Jul'02).

    I have always found both to be reliable and accurate.

    The cast s/s rcvr rifle is very well done while the stamped-rvcr version is a sloppy copy. O'course the former cost me 50% more than the latter. ;)

    The stamped-rcvr rifle did require beaucoup cleaning and a modicum of tweaking on my part, but it came to me NIB from Century, so it matched my expectations.
     
    gotboostvr and BigBlue 94 like this.
  10. MachIVshooter

    MachIVshooter Contributing Member

    Joined:
    Aug 11, 2005
    Messages:
    17,651
    Location:
    Elbert County, CO
    Sure you can, but you need to use a stainless filler. Standard copper coated carbon steel wire won't bond well.

    I've repaired quite a few sand cast top break revolver frames with 321 wire using the TIG.
     
  11. Saguy46

    Saguy46 Member

    Joined:
    Aug 26, 2022
    Messages:
    4
    Location:
    Texas
    Could you share that list? I have a Cetme C parts kit that I would like built. I reached out to one well-regarded HK builder who said they didn't do Cetme model C, which I find odd. He explained that HK made over 200 revisions on the G3.
    Anyway, any recommendations are appreciated.
     
    Last edited: Nov 10, 2022
  12. tark

    tark Member

    Joined:
    Nov 25, 2013
    Messages:
    4,601
    Location:
    atkinson, ill
    I have never heard of this. Can you give a source?
     
  13. Jim Watson

    Jim Watson Member

    Joined:
    Dec 24, 2002
    Messages:
    32,985
    Location:
    Florence, Alabama
    Author of the Wiki says 6.5x50SR G ammunition was loaded with double base powder at lower velocity to reduce muzzle flash from the short barrel of the weird Type 11 machine gun. Nobody I can Google will say whether it went into standard issue for rifles, too.
    Japanese ammo logistics must have been awful. They started out with 6.5mm rifles and LMGs and a 7.7mm HMG. They decided they needed more rifle power against angry Chinese so they adopted a 7.7mm rifle round different from the MG ammo. Then MGs for the rifle round. And light load LMG 6.5 on top of all that mess. And let's don't forget the IJN with real .303 British Lewis guns.
     
  14. Carl N. Brown

    Carl N. Brown Member

    Joined:
    May 10, 2005
    Messages:
    10,165
    Location:
    Kingsport Tennessee
    Jim Watson: ".... And let's don't forget the IJN with real .303 British Lewis guns."

    That ammo was listed by IJN as a 7.7mm rimmed.

    I think unnecessary ammo supply complications in the WWII Japanese and Italian militaries ought to be a lesson.
     
    gotboostvr likes this.
  15. JDGray

    JDGray Member

    Joined:
    Sep 16, 2005
    Messages:
    5,697
    Location:
    SW MI.
    A good gunsmith, does not have to tell you how good he is... Sorry you did not get a good one.
     
  16. doubleh

    doubleh Member

    Joined:
    Feb 14, 2007
    Messages:
    5,466
    Location:
    NM-south of I-40
    I know absolutely nothing about the gun but the weld in the second picture failed in the HAZ and considering the thinness of the part that failed I can understand why even if it wasn't cast. I would be knocking on the door of the person that did that.
     
  17. Rshooter

    Rshooter Member

    Joined:
    Sep 29, 2007
    Messages:
    1,312
    Location:
    Tennessee
    I am not a welder but am a NASA certified solderer. That weld looks like what we used to call a glob job.
     
  18. jmorris

    jmorris Member

    Joined:
    Sep 30, 2005
    Messages:
    21,202
    Yeah, it seems that one is lucky if the parts are correctly oriented before they pull the trigger. I had a century built one I had to cut apart to correctly align the parts and reweld.
     
  19. 4v50 Gary

    4v50 Gary Moderator Staff Member

    Joined:
    Dec 19, 2002
    Messages:
    21,558
    I'm against welding on the barrel. Too much heat and you compromise the metallurgy. Besides, that's a very bad weld.
     
    Brin likes this.
  20. lysanderxiii

    lysanderxiii Member

    Joined:
    Mar 21, 2015
    Messages:
    2,607
    Location:
    North Carolina
    The trunnion is supposed to be plug welded to the sheet metal receiver.

    The barrel is supposed to be a 0.002" interference fit with the trunnion, and pinned in place.
     
  21. 12Bravo20

    12Bravo20 Member

    Joined:
    Oct 12, 2007
    Messages:
    4,897
    Location:
    Missouri
    Then the said gunsmith messed not once but twice by not properly installing the barrel and a bad weld job.

    Either way I would find a better smith to fix it.
     
  22. BreechFace

    BreechFace Member

    Joined:
    Mar 2, 2020
    Messages:
    2,517
    This!
     
  23. Ignition Override

    Ignition Override Member

    Joined:
    Sep 15, 2007
    Messages:
    8,641
    Location:
    The Mid-South.
    Wow. What a mess!

    The potential for such amateur work, or Any work which causes any problem…

    …explains —Exactly— why my recent semi-auto rifles were purchased new-in-box , via Buy Now. The first such were the VZ-58 and ZPAP.
    Then a pair of HK-91 clones: PTR-91 (A3SK) and the “classic GI” version.

    I never wanted any kit , needing an experienced pro.

    My condolences to the OP.
     
    Last edited: Nov 17, 2022
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice