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Pro Sport To Sub6fpe 7,5j

Discussion in 'Technical' started by Ni3mand, Apr 27, 2021.

  1. Ni3mand

    Ni3mand Well-Known Member

    Messages:
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    Location:
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    Hi Airgunners,

    I need to bring my sub12fpe Air Arms Pro Sport in .177 Cal
    to a power of 5,5fpe which is 7,5J. This way I could import it from Poland to Germany.

    I purchased 2 "F" springs of a Weihrauch HW50,
    dimensions: 200mm lenght 14,3 inner diameter, wire 2,8mm and 26 coils
    also I just bought a TBT kit with Short Stroke Extension + 25mm Weihrauch Pistonseal.

    Is that enough to bring the Power down? I know to check the Output with a Chrony
    Does removing the Top Hat also lower the Energy?
    A guy from Poland told me his TX200 had about 11fpe/15J with a weaker "F" Spring 230mm lenght Hw97 with 7,5J :D

    Im Currently in Germany, the pro sport is located in Poland,
    so once I move off I wont be having time playing around (72h time limit otherwise 10 days quarantine)
     
  2. Fatbob59

    Fatbob59 Busy Member

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    Crude but quick , cut slits in the breech seal with a knife , will then leak air and bring the power down ?
     
    mutley likes this.
  3. shauny

    shauny Top Poster

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    Location:
    not far from the beacons
    just take out the spring and piston and post them on.
     
    Ste.v.a, mutley, SlugFest and 4 others like this.
  4. shergar

    shergar Big Poster

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    As above for importing gun. For legally using gun in Germany the F spring alone will probably be too powerful. Standard 12J UK spring has ID of 15 mm and wire gauge of 2.87 mm so if cut down to 200 mm is much the same as the weihrauch. Certainly replace any large steel top hat with a minimal delrin. and cut spring to give minimal pre load. If gun still above limit a thick nylon washer 25 mm OD in compression tube ahead of piston will reduce swept volume and allow further cutting of spring.
     
    CJD likes this.
  5. mikeyhall1

    mikeyhall1 BRIT SEALS - M & M Products - TbT

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    Yup, that’s what I would do
     
    Ni3mand likes this.
  6. Deejayuu

    Deejayuu Donator

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    My concern would be that without the "F" in pentagon it may need EWB anyway regardless of muzzle energy. To do with date of manufacture, spring or no spring, methinks.
     
  7. Ni3mand

    Ni3mand Well-Known Member

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    Location:
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    No Problem ;)
    The F in Pentagon Has No Meaning in Poland. So everybody can Buy legal a Stamp and Bring the Stamping in the Airrifle but this counts for every country except Germany.
     
  8. Ni3mand

    Ni3mand Well-Known Member

    Messages:
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    105
    Location:
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    taking out the spring and bring the gun to germany as functionless, not a bad idea
     
    shauny likes this.
  9. Ni3mand

    Ni3mand Well-Known Member

    Messages:
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    105
    Location:
    Germany
    Short Update:
    HW 50 Original German "F" Version Spring sub6fpe works only with a Spring Guide Diamenter of 14.0mm (original AA hast 14,5)
    Without Top Hat and Preload Washer IT has with Jsb Exact 0,547g about 6,5Joule and ist Legal to Germany
     
  10. Nobby

    Nobby Keyboard Hero

    Messages:
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    Location:
    Tremar
    Do you have a spring guide that fits, 14mm dia?

    You might be able to fit the top hat and still remain under 7,5 J.
     
  11. Ni3mand

    Ni3mand Well-Known Member

    Messages:
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    Location:
    Germany
    Hi, i Had to Take 0,5mm Off the spring Guide. For the top hat i need a Lathe. Rifle shoots fine, lost a Bit Power to about 5J now 3,6fpe. thats No Problem Maybe a Hw97 spring should do the Job
     
  12. shergar

    shergar Big Poster

    Messages:
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    Consider a longer latch rod, 169 mm, to give a Mk2 type short stroke.
    The soft spring required for low power, working with a 95 mm firing stroke, results in a slow action.
     
  13. Ni3mand

    Ni3mand Well-Known Member

    Messages:
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    105
    Location:
    Germany
    Short Update:
    Installed the TBT Short Stroke Extension with 25mm Weihrauch Piston Seal.
    With new Hw85/95/98 Mainspring (220mm lenght) 1 Washer and Top Hat my Pro Sport is Just Under 6,2 Fpe / 8,5J (Just fine, Im within Tolerance) smooth Shooting

    I purchased a Walther LGU 7,5J Piston, for Experiment for Tx200hc
     

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