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Problems with AT-84S (CZ clone)

Discussion in 'CZ Club' started by OldLawman, Nov 16, 2011.

  1. OldLawman


    Apr 1, 2005
    Baltimore, MD
    A friend has asked me to help him diagnosing a problem. He has a AT-84S, the Swiss clone of the CZ-75.
    According to him. the gun will hand-cycle an entire magazine - feed, eject, extract. When he fires it live, after the first shot, the empty case is partially extracted, and the next round tries to feed - a classic double feed.
    The extractor hook and ejector are not broken or chipped, and the extractor feels like it has enough tension when pushing a live round from underneath.

    Any help ?
  2. GAFinch


    Feb 23, 2009
    Probably the recoil spring.



    Dec 20, 2002
    Sounds like weak ammo or lack of lubrication.
  4. I had the same exact issue with my 75BD. Fired case would get hung up on the incoming round's case mouth.

    Two things fixed it for me. MecGar mags, and taper crimping everything fed through the gun. I even tried using a 10% Wolff mag spring to no avail. The MecGar spring is stronger.
  5. B.Reid


    Jun 20, 2005
    Better than a taper crimp, I started using the "Lee Carbide factory crimp die" this has solved most of my feeding problems with my reloads. If you have tight chambers you really need to run your loads through this die.
  6. Bret

    Bret Crimping Master

    Jan 21, 2003
    North Georgia
    OldLawman, please let us know exacty what ammo your friend is shooting. This is critical for us to help determine the cause of the problem.

    The OP didn't indicate that his friend was shooting reloads. Regardless, I have several CZ's and have been reloading successfully for them for years. I use a regular taper crimp die. If you have to use a Lee FCD to post size your cases in order to get them to work in your CZ, something is wrong. Either your CZ's chamber is under spec. or something is wrong in your reloading process. I realize that this is kind of off topic and I'm not trying to start a debate, but I didn't want the OP to think this was a potential solution to his problem. At the same time, if it works for you and you're happy, then consider my advice worth what it cost you.:supergrin:
  7. B.Reid


    Jun 20, 2005
    I never had the issue with the CZ but with match grade chambers, but now I factory crimp all my autoloader brass. It just make things work 100%.