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johnbu

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johnbu last won the day on September 29 2017

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About johnbu

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  1. johnbu

    cheetah 12 - last round eject failure

    $400 vs $1000. But i do hear ya.
  2. "All" ? Think they generalize much? Lol. Although, that does look interesting.
  3. johnbu

    cheetah 12 - last round eject failure

    Thanks! There does seem to be some rubbing, but it also seems to present the shells too high. They then slam into the top of the edge of the chamber entrance. Not sure of the correct terms. The shells get stopped hard enough to deform the plastic... a lot. I have trimmed the mags to reduce drag and it's getting better. The factory 5 rnd seems to work fine now.
  4. My friend has one of those. Nice gun. Trigger is a little gritty and lurchy with a heavy wall in DA. SA is not bad. Polishing the action, lifter, hammer hooks spring swaps snd a few other "tricks" will drop the DA below 6# of butter smooth.
  5. johnbu

    cheetah 12 - last round eject failure

    Oh I see it now.. Yep that is a problem. Looks like the part was set in the process machine incorrectly which cause the pocket to be formed incorrectly.. It did not wear out, the part was made wrong. Gosh. I see it now. Amazing that no matter how many of these come through the door, there's always something new. Hey, Mike, just noticed you are in ALBQ. We used to live over on the mesa in Rio Rancho by the Intel Plant. Anyway... Put the new carrier in and the gun now cycles without locking up. However, issues remain. But, I think it's magazine related more than anything. Now, I'm asking for tuning tips for the SGM 12 round magazines. The round being fed while firing will ram into the TOP of the barrel opening and hang up on the lip that the rim of the cartridge is supposed to sit in. I have a pic in my phone and will add it shortly. My "assumption" is that the front of the magazine and potentially the back is sitting in a odd spot. I've read where people file material off the mags to fix issues. But, I dont want to just blindly whack away at it! LOL I'm old and dumb, but not that dumb. Oh, it does it with the gas system on settings 2, 3 and 4 (4 being largest amount of gas). With no magazine in, it will eject the case on setting 2 without problem sending it 4-6 ft. In fact, it may be worse with the gas system on the most open, biggest dot, setting. Unlike the real Saiga guns, the 4 gas ports are well centered and all open. Guess they don't have vodka ?
  6. johnbu

    cheetah 12 - last round eject failure

    Dang! Called on Friday and "ding dong" ... package on the porch. Good customer service? I'd call it great!
  7. johnbu

    cheetah 12 - last round eject failure

    I agree! Hoping the replacement is much better!
  8. johnbu

    cheetah 12 - last round eject failure

    I am hopeful the replacement part is done correctly. Will post up on how that works out.
  9. johnbu

    cheetah 12 - last round eject failure

    I positioned the bolt to show the "tab" that rides in the "slot" can jump out of the slot. But, thank you for posting that video. It shows a lot of detail.
  10. johnbu

    cheetah 12 - last round eject failure

    Contacted SDS and while thw issue is disappointing the response was refreshing. Good CS. He is sending a replacement carrier asap. He thinks it was an "old part" with a known and corrected problem. I do believe him and will update when the new "corrected" part comes in. For the record, i am optimistic!
  11. johnbu

    cheetah 12 - last round eject failure

    You can see in the one picture how loose it fits in tbe carrier. That allows the bolt to get out of the channel in the carrier on recoil and bind up.
  12. johnbu

    cheetah 12 - last round eject failure

    The bolt carrier seems to be worn out after 140 Federal bulk pack bird shot rounds fired. The bolt doesn't rotate and binds the action. Contacting sds imports shortly.
  13. johnbu

    cheetah 12 - last round eject failure

    No, wisconsin.
  14. johnbu

    cheetah 12 - last round eject failure

    Happens with 2 brand new sgm 12 round magazines. And... the gun FUBAR'ed tonight at a 3gun practice. Fail to FEED. rounds just wouldn't go into the chamber. Will have to investigate tomorrow.
  15. johnbu

    cheetah 12 - last round eject failure

    Dang, spoke too soon. Last round...the magazine is up into the receiver slightly too high and is knocking the spent case off the extractor on the way back. Why only one the last round? Dunno! Does anyone make a mag hold that is slightly longer?
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