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QB/XS79 .22 Co2 Conversion To PCP/HPA

Discussion in 'Airgun Data Center' started by milegajo, Sep 25, 2012.

  1. milegajo

    milegajo Busy Member

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    Location:
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    To provide a challenge as well as an education into the workings of a pcp air rifle, I took the plunge and purchased an XS79 for the princely sum of....£99.

    After some polishing, fiddling and faffing. I did it.

    [​IMG]
    [​IMG]
    [TABLE="class: tr-caption-container, align: center"]
    <tbody>[TR]
    [TD="align: center"][​IMG][/TD]
    [/TR]
    [TR]
    [TD="class: tr-caption, align: center"]Close up of the On/Off valve and HPA bottle on the QB/ XS79[/TD]
    [/TR]
    </tbody>[/TABLE]

    Now this path is very well trodden and recounted by men far more adept than I. To that end I have compiled my research and hereby offer it up to you for all those wish to try this very worthwhile project for themselves.

    Pics, Links, How to's and More for the QB/XS79 HPA/PCP Conversion
     
  2. bigj09

    bigj09 Engaging Member

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    Location:
    newquay cornwall land of pastys and cider
    looking good ive got a xs79 in 177 cal on hpa aswell are you using a ag1 on/off adapter
    thanks
    bigj09
     
  3. jolo-bolo

    jolo-bolo Donator

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    A well compiled set of instructions and pictures will make tuning an easyer prospect saving time in hunting round the tinterweb for the information. Nice one
     
  4. milegajo

    milegajo Busy Member

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    That's the one!
     
  5. ratman60

    ratman60 Very Active

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    thats very good did you change the seals as well ? i dont use an ag1 on mine, what about the silencer? or shorter barrel and re crown?. what ft llb you getting now ?
     
    Last edited: Sep 26, 2012
  6. milegajo

    milegajo Busy Member

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    Welsh Willy seals which are a must in my opinion. Cotton wool 'filter' and piercing pin removed from valve. Standard barrel length as this gun is for long range corvid sniping, 1/2" UNF silencer fitted via a 15mm adapter.

    612-614fps = 11.8/11.9 ftlbs with Crosman Premier Ultra Magnums. May snip a coil off the hammer spring to reduce air consumption and bring to within a safer margin.
     
  7. bobbie1

    bobbie1 Busy Member

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    You done a good job , I have a .177 and .22 runnin on air , I always use on/off with burst disc in between for safety ,
    they are very consistant and lots of shots ,
     
  8. milegajo

    milegajo Busy Member

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    Like Ratman60, I had a leak from the valve area. The rough screw cuts, despite ALOT of polishing kept cutting the two o-rings on the mounting block. Fixed it by dropping a single larger, thicker o-ring between the valve body and the block. Aside from that and lots of deburring it was very straight forward. I'd like to do a .177 too but all in good time...
     
  9. ratman60

    ratman60 Very Active

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    hello thats interesting as my 79 has still got a very very slight leak again despite sorting the block seals, maybe it might need your idea but WW change the block to a 3 seal one. used a more better sealant. i think its leaking through the valve so might try the balloon test.
     
  10. Danp19831

    Danp19831 Member

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    What psi output are you guys running your regulators at
     
    genisis22 likes this.
  11. timmytree

    timmytree Keyboard Hero

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    Not sure you'll get a reply Dan, this thread is from 2012.
     
  12. Danp19831

    Danp19831 Member

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    Hahaha didn't read the date
     
  13. genisis22

    genisis22 Engaging Member

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    Hi for ref .set reg around 850 .177 780/800 22
     

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