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my ultra missfired twice

Discussion in 'Anything Airgun Related' started by Alex.B, Jan 17, 2014.

  1. Alex.B

    Alex.B Keyboard Hero

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    Me again , just been running a few shots down the garden with my mmc ultra . All was well until it made less noise and the pellet didn't come out :confused: re cocked it and it fired :confused: it done it twice but now its OK :confused: had another fifteen shots no problem.

    Any ideas ?

    Alex
     
  2. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    I've heard of exhaust valve issues with these causing low output.. probably worth running a good few shots over a chrono to make sure it's consistent and you're getting no low velocity shots.

    Another thing to consider is the mag - older types (with the internal latching mech) are prone to skipping chambers and potentially jamming - so it's worth a look to make sure it's functioning correctly ;)
     
  3. Alex.B

    Alex.B Keyboard Hero

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    Mines a single shot so not a mag issue , will get a chrono on it at the weekend.
    Its strange when it didn't fire then when recocked the pellet seemed come out with a bit more oomph !

    Will get Chris to have a look
     
  4. vitalich

    vitalich Keyboard Hero

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    better to strip it down for cleaning

    a very small flake can be found on valve
     
  5. bunnyblatter

    bunnyblatter Pro Poster

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    Is the MMC cocking thingy at the front rubbing on the stock ? My mates did this and it was sorted in no time.
     
  6. Alex.B

    Alex.B Keyboard Hero

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    Thanks , cocking thingy seems free but will check .
     
  7. Seamaster

    Seamaster Super Moderator Staff Member Mod/Admin

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    Let's give it a full chrono string this weekend Alex. See if we can find the problem.
    As said above, a bit of crap in the exhaust valve sounds likely.

    Chris
     
  8. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Maybe when you fired it the mag didn't rotate, so when you recocked it to fire and pushed the probe back in, there was no pellet in the chamber,

    Mine did that a few times until I gave the mag a good clean and small spray with 3-1 oil, fine after that:)
     
  9. Seamaster

    Seamaster Super Moderator Staff Member Mod/Admin

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    It's a single shot Steve.

    Chris
     
  10. Seamaster

    Seamaster Super Moderator Staff Member Mod/Admin

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    Oh and 3 in 1 oil is a bad idea on the mag as it's a blend including mineral oil which will eat your seals faster than a killer whale eats, well, seals.

    Chris
     
  11. Alex.B

    Alex.B Keyboard Hero

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    Thanks Chris , see you soon :up:
     
  12. tombillings916

    tombillings916 Donator

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    You don't see to have a lot of luck with your new rifles Alex, I'm sure Chris will sort it for you.
     
  13. Alex.B

    Alex.B Keyboard Hero

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    I do hope so Tom , at the mo I can ill afford a trip to the gunsmith ! Bloody dentist and short hours but at least I didn't get made redundant .
     
    Last edited: Jan 17, 2014
  14. Akita177

    Akita177 The Absolute State of Britian podcast

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    Make sure the cocking knob is returning free-ly as if it doesnt it will stop the hammer hitting the firing valve properly, usualy just a stock fitment problem.
     
  15. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    i am a complete arse!!!!:d
     
  16. Alex.B

    Alex.B Keyboard Hero

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    Well after a visit to Chris's house and more nice coffee :D we found a small amount of rubbing on the stock and a burr where the stud for the sling had been fitted . Cleaned / sanded and reassembled , 46 shot chrono string done with no problems. Again Chris helps me out, I can't thank him enough :)
    4 big black noisey b*****s nailed tonight , . I love this gun :D
     
  17. stevemandm

    stevemandm Honorary Member

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    sounds like you got your own guardian angel/gunsmith in chris ! :)
     
  18. Alex.B

    Alex.B Keyboard Hero

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    I think you are right , he's taught me so much not only about my gun but field craft too . Little snipetts of info and getting to use some of his guns :D . All this from a plea for help on this forum when I first started here.

    Who knows what info I've missed? If I could just stop jibbering on and listen more lol :D
     
  19. bunnyblatter

    bunnyblatter Pro Poster

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    Sounds like it was what I mentioned. Same happened to my mates
     
  20. Seamaster

    Seamaster Super Moderator Staff Member Mod/Admin

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    Thanks for the heads up mate. After we de-burred the stock and fitted it back to the action a bit less tight it was faultless.
    It's a really nice, consistent gun. I'd forgotten how nice the Ultras are.
    By the way Alex, it was a pleasure mate.

    Chris
     

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