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Kral puncher breaker bulpup.

Discussion in 'Anything Airgun Related' started by spcook, May 2, 2016.

Thread Status:
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  1. Jim-in-Darwen

    Jim-in-Darwen Donator

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    Location:
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    You are in Lancashire and there are several hydro dippers in the county.
    Gun stocks are one of the specialities of this one in Blackburn
    http://www.prestigecustomcoatings.co.uk/patterns/

    Jim
     
  2. kenhawker

    kenhawker Honorary Member

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    Location:
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    Here's my findings.
    The twang seemed be the spring shaking (like a sh*ting dog) on firing. That had to go along with the hammer bounce and the slide pin that serves no purpose.
    So I fitted a hammer spring with a smaller i/d, a thicker coil and 12mm shorter than the standard hammer spring. So I used a fac rapid 7 spring.
    Now it's as loud as a mouse fart.
    And the consistency is a lot better.
    Accuracy is good to once all the sears have been polished and a lighter spring has been fitted on the trigger rod.
     
  3. Chris-C

    Chris-C Engaging Member

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    Location:
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    Hi Kenhawker, is that "Theoben Hammer Spring FAC Part No: TH202143"
    Found that on John Knibbs web site, only £14.50 so might give it a go.
    I tried, after a similar post, putting in a rubber washer behind the spring but that did not reduce the twang.

    Cheers
     
  4. kenhawker

    kenhawker Honorary Member

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    It looks very similar. I was given mine in a batch of springs off my shooting partner.
    Best I can do is to remove mine and take photographs of all the measurements and post them here.
     
  5. Chris-C

    Chris-C Engaging Member

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    That would be great, will pop into Knibbs next week and compare against your dimensions

    Cheers
     
  6. kenhawker

    kenhawker Honorary Member

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    sorry bud I've been busy with my grandkids today but I will get some done tomorrow when they've all buggered off home.
     
  7. Chris-C

    Chris-C Engaging Member

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    No problem, will be in Birmingham all next week so no rush..
    Would be good to rid the twang. Its the only thing letting this little gun down.

    Then will really look at hydro dipping the stock. Think it needs a style lift....
     
    Last edited: Jul 9, 2016
  8. kenhawker

    kenhawker Honorary Member

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    Location:
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    Wire is 1.5mm
    O/D is 11.5mm
    Length is cut down to 55mm
    Its a carbon steel spring from a rapid 7.
    [​IMG]
     
  9. kenhawker

    kenhawker Honorary Member

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    Set at 11.2fpe there is a 3mm gap. There for it gives the hammer stroke a kind of slingshot effect.
     
  10. kenhawker

    kenhawker Honorary Member

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    Heres the o/d and wire size.[​IMG]
     
  11. kenhawker

    kenhawker Honorary Member

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    It still has a bit of a thump but that's probably because my ear is next to the action but when it's held away and fired or is some one else has a go it's in mouse fart territory.
     
  12. Chris-C

    Chris-C Engaging Member

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    Great information, many thanks
    Will give this a try at the weekend

    All the best
     
  13. kenhawker

    kenhawker Honorary Member

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    no worries
     
  14. Riddmeister

    Riddmeister Airgun Nut

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    Tried one out in a local rfd. I found there to be a long uncertain pull on the trigger and a loud internal twang on firing.
     
  15. Tron

    Tron Donator

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    Its easy to dial out the long first pull also the sear let off, mine has a first travel of one eighth and the sear just about one pound. only two screws to adjust,
     
  16. Wacko74

    Wacko74 Busy Member

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    Very interesting thread guys
    i wish I had the confidence to start pulling mine apart
     
  17. rkr

    rkr Posting Addict

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    The twang could actually be ping. If they copied Evanix there's no depinger and that 35mm tube gives a very interesting ping harmonics when firing. Fix is to install a depinger. The trigger sear geometry in Evanixes pulls back the hammer making for poor trigger feel, easy to fix though. The long pull sounds like poor sear adjustment but it could also be pushrod flex. IMO Kral gives you quite a lot of gun for the money with these PCPs, I've been considering getting one for a .257 project.
     
  18. Tron

    Tron Donator

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    Do you know thats the way I set up all my PC rifles, in my Puncher I have shortened the hammer spring and like you, have a non tensioned valve stem. I believe that helps to remove the harmonic ding on firing.:up:
     
  19. bl4de

    bl4de Donator

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    Well i've just placed an order for mine in .177 Synth flavour. From reviews i've read and watched i doubt i'll be regretting the purchase. will let you all know when it lands.
     
  20. j rayner

    j rayner Engaging Member

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    looking forward to your opinion of this pup
     
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