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Pp700sa - Seems Under Powered.

Discussion in 'Technical' started by kachariw, May 31, 2018.

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  1. kachariw

    kachariw Member

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    Location:
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    Just bought a S/H pp700SA. After replacing the broken o-ring on the cylinder the pistol holds the charge well.
    The first few shots seemed fine but then instead of a 'thud' with each shot, I got more of a 'twang'. A bit like the sound I get from my BSA R10 when the cylinder is nearly empty.
    The rounds also fall very short, so I'm guessing there is a leak somewhere.
    I tried the tissue paper test but it didn't seem to move.
    I also stripped the pistol down and all o-rings seem intact.
    Is there anything else I should check/adjust?
    Thanks in advance
     
  2. Gazza600

    Gazza600 Engaging Member

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    Location:
    Pontefract
    How is the tension when you cock the hammer? Has it changed at all? If you whip the grips off the hammer spring tension is adjustable up inside the chassis.
     
    kachariw likes this.
  3. kachariw

    kachariw Member

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    Thanks, thats done it. The chap I bought it from had loosened off the tension for transit.
    Now to decide if I need a huma reg or not......:)
     
    Gazza600 likes this.
  4. Bozz

    Bozz Posting Addict

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    They are regulated in a form once i had stripped and cleaned the belville washers it ran a lot better.
    Graham.
     
  5. kachariw

    kachariw Member

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    Were you fussy about how you put the belville washers back?
     
  6. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    All the examples I've experienced suffered from terrible reg creep, meaning if left for any time muzzle energy dropped off significantly; could well be why the previous owner got rid of it.

    More info here ;)
     
  7. kachariw

    kachariw Member

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    Thanks Cloverleaf, I'm sure this will be an issue moving forward but for now the problem was with slack cocking hammer tension.
     
    cloverleaf likes this.
  8. Bozz

    Bozz Posting Addict

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    Hi yes after stripping and rebuilding the only time i got anything like creep was just after filling , This seams to be an issue with a few pcp's but if you just give them a couple of shots after filling then it is ok. Yes the hammer spring can move at times.
    All the best Graham
     
    cloverleaf and kachariw like this.

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