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Question Smk Pr900w Problem?

Discussion in 'Anything Airgun Related' started by Jason Fisher, Aug 28, 2018.

  1. Jason Fisher

    Jason Fisher Newbie

    Messages:
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    Location:
    Derbyshire
    Hi everyone, I have recently got an smk pr900w 177 air rifle and when firing it sounds quite loud, and also makes a farting noise as the trigger is pulled, anyone got any advice on this or is this how they sound when fired?
     
  2. VIKING6661

    VIKING6661 Posting Addict

    Messages:
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    Location:
    Chigwell Essex
    Could be firing more then 12lbs maybe get it chronoed and go from there maybe


    .
     
  3. ped

    ped Posting Addict

    Messages:
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    Location:
    leeds
    get it chrono'd (not by a shop) if you bought it from Poland as a few have been sent with the un restricted tp
    the farty noise could be spring twang John Small makes replacement guides and top hat bushings
     
  4. Darren Petts

    Darren Petts Temporarily Alive

    Messages:
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    Location:
    Wakefield
    The farting is almost certainly hammer bounce; a situation where the hammer hits and opens the valve a number of times due to bouncing. It's only real drawback is this wastes air. Either the reservoir is very low on air or the hammer spring may have been changed. They are no more or less prone to hammer bounce than any other normal poppet valve design. The std "silencer" is very poor so don't expect great results from it. These are rather easy to "tinker" with and as such you definitely need to chrono it having bought it secondhand. As said don't get this done at a shop as they're legally obliged to retain it if over but ask on here if someone local could help you.
     
  5. jb37

    jb37 posted

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    Location:
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    May help if you add a location someone might then be able to help out with a chrono
     
  6. Zubar

    Zubar Engaging Member

    Messages:
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    Location:
    In the woods, Meifod, Wales.
    I used to have one of these. Yes they are loud with the standard mod. Get one made by one of the guys on here I like Mattys ones.

    The farting noise is hammer bounce as said above.
     

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