Standard Steyr Transfer ports

Discussion in 'Steyr' started by ksts100, Mar 19, 2019.

  1. ksts100

    ksts100 Member

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    Jan 22, 2017
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    Location:
    Athens Greece
    Has any one tested different size TP than the standard black ,silver ,green transfer ports ?
    Maybe with different reg pressure we need and different TP in order to get better sweet spot.
    For example to open a different/bigger diameter hole 3mm or 3,5mm in a silver Tp instead to use the black (4mm).
     
  2. Conor

    Conor Never been banned from sales Staff Member

    Joined:
    May 4, 2009
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    3,277
    Location:
    Ardboe, Co.Tyrone.
    Club:
    Back Hill Ballistics; DFTC; Nelson FTC
    The black 4mm one is the optimum from my tests. I’ve tried them all even the sizes you suggest.
     
  3. Fly fisher

    Fly fisher New Member

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    Jul 31, 2016
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    Location:
    Hastings
    Club:
    Kent Woodsmen
    When I changed to a black port the power went up considerably. By reducing the power and relieving some pressure on the hammer spring I feel that I may have been de stressing the whole firing system. All good.
     
    Lavant_Lad and ksts100 like this.
  4. Ratinator

    Ratinator 77.74

    Joined:
    Jan 2, 2010
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    Location:
    stourport
    Club:
    Millride FTC / Nomads
    I reamed a black transfer port out and polished the inner face to a mirror finish.
    Chronoed the rifle with black transfer port then the highly polished port , no difference in FPS at all .
    Black seems to be the way to go .
     
    ksts100 likes this.
  5. Andy P

    Andy P Gently does it......

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    Jan 31, 2014
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    Bedfordshire
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    Mid Shires Marksmen / Hereward FT & ARC
    What about drilling out to 4.5mm.?

    I wonder if this would allow more power and relieve even more from the hammer spring.?
     
    ksts100 likes this.
  6. hmangphilly

    hmangphilly Floppy Quick Phil

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    wimborne
    the hole in the stabiliser is 4mm
    the flats of the hex to tighten the tp are 4mm + a smidge
     
    cloverleaf and ksts100 like this.
  7. Andy P

    Andy P Gently does it......

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    Jan 31, 2014
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    Location:
    Bedfordshire
    Club:
    Mid Shires Marksmen / Hereward FT & ARC
    Ah nothing to be gained then unless you drilled out the stabiliser and make a whole new transfer port.
     
  8. hmangphilly

    hmangphilly Floppy Quick Phil

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    Ahh
    i forgot to mention the port size under the firing valve .............................It's all getting a bit involved
     
  9. cloverleaf

    cloverleaf Active Member

    Joined:
    Sep 12, 2014
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    303
    Location:
    Oxfordshire
    Adjusting striker spring preload to give the same muzzle energy with each different port, a larger port means a lower ideal operating pressure (reg set point) and less sensitivity to pellet mass. That's all.. so when it comes to ports as long as the gun is set up properly bigger is always better.
     
    Mr Blonde likes this.

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