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Thread: "UMP" loose barrel

  1. #21
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    Dinsdale Piranha's Avatar
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    No wise-ass, I'm not interested is perusing a solution to something that shouldn't have been a problem in the first place...and isn't my problem in the second place. The firearm is only months old and is still under warranty, it's Omega's problem. I admit that I've gotten what I paid for, I should have spent a few extra bucks and bought a better quality clone. In the meantime I'm going to keep sending this back until they get it right.
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  2. #22
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    Bruh it was dry humor....ease up man, dude jabbed you a little and still offered help. Hope your problem gets solved and your day gets better.
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  3. #23
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    Sure, thanks for the heads up.

    My ex-F.I.L was career USAF CATM, 26 years. Good guy, He passed away back in 1990 though, likely before your time.

    My barrel measured .863 with a Brown & Sharpe caliper, barrel just fell out. Not an interference fit by any means. I'm going to dig out my T-gauges and try to get a trunnion bore measurement. Trunnion is intact, still attached, looks fine. I'm curious what the blueprint dim for that barrel is, trunnion bore too for that matter.
    Last edited by Dinsdale Piranha; 01-09-2020 at 06:40 PM.

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  5. #24
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    No worries buddy....Yes Sir before my time....I was in the Corps from 95-03 and Air Guard 06-12. I am curiously watching this because I am a Omega UMP owner as well. I am a little embarrassed to say I have had it for a year maybe close to 2 and I have fired something like 5 rounds through it (been really wrapped up in 416/M27 building). But I do want to be in the know about this so when I do run her I am not surprised and stumped by this issue.

  6. #25
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    I remeasured the barrel OD with an old-school vernier mic and got .865

  7. #26
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    Quote Originally Posted by Dinsdale Piranha View Post
    I remeasured the barrel OD with an old-school vernier mic and got .865
    That's likely within mfg tolerances of my factory USC barrel. If you have radial play, you either have an oversized trunnion, or it's not fixed rigidly in the receiver any more. Good luck.
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  8. #27
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    Could you post a pic of the barrel extension cut and pin where the pin retains it in the receiver?

  9. #28
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    Like this?


  10. #29
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    Quote Originally Posted by Dinsdale Piranha View Post
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    They use a pushpin to retain the barrel? HK uses a spring pin. But regardless, the retaining pin isn't what controls radial movement. That is purely the diameters of the trunnion and the barrel stub. The only degree of freedom that the pin constrains is along the axis of the barrel. If you can feel the barrel moving up/down/left/right (or in a "nice little circle" like you write), it's the barrel stub or trunnion. Based on the wear mark on the barrel, it doesn't look like it's been moving axially.

  11. #30
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    Well, that looks both barrel & pin ok to me, not factory pin but those push pins work fine. I'm thinking trunnion is out of specs. The UMP needs to go back to the dealer, you have done all you can at this point and really shouldn't have to even do as much as you have this is a warranty issue that the factory needs to make right for you.

    Quote Originally Posted by Dinsdale Piranha View Post
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