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Re-Zeroing with Moderator?

Discussion in 'Anything Airgun Related' started by bobnik, Jul 15, 2014.

  1. bobnik

    bobnik Engaging Member

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    Location:
    Hemel Hempstead
    My springer was shooting extremely accurately and zeroed at 25 yards. Cloverleaf groupings. I fitted a silencer adapter (2 grub screw slip over type - 1/2" unf) - It still shot the same.
    When I added a 6" moderator the zero went right off - by miles! I checked inside the silencer and there are no signs of clipping etc.
    Is this normal? Does it disturb the barrel harmonics etc by fitting the extra weight/length.

    Thanks
     
  2. mattyts

    mattyts Donator

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    Location:
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    Yes but not usually 6 inch,maybe 1 or 2.
     
  3. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    The gun recoils and funnily enough hanging a weight off the very end of the barrel will affect the way it moves :p

    I'd be surprised if fitting a mod didn't change the POI; however as above it should be 2-3" max and not miles. If it groups just as well with the mod I'd just rezero and carry on; although the presence of an adaptor suggests that the setup could be more prone to alignment issues..
     
  4. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Location:
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    It just changes the barrel harmonics, unless there is alignment issues. UK Neil silencer will
    push the poi 1.5" left from zero from my usual silencer:)

    Even a couple of stray fibers from baffling material can interrupt the pellets flights!
     
    Last edited: Jul 15, 2014
  5. Akita177

    Akita177 The Absolute State of Britian podcast

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    Location:
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    Fitting a silencer i usualy have to bring the zero up.
    If its still grouping just adjust your zero, though when using adapter you need to check the silencer is concentric with the bore/barrel.
     
  6. mattw975

    mattw975 Big Poster

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    I left my heart in Newbury
    Is it still grouping though ?

     
  7. bobnik

    bobnik Engaging Member

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    Location:
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    No, shotgun pattern! I have removed the silencer and all is fine again so I assume that there was some misalignment:D
    Thanks!
     

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