AIR ARMS S510 EXTRA FAC .25 ISSUES

Forums PCP Airguns AIR ARMS S510 EXTRA FAC .25 ISSUES

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    Nainoa88
    Participant
    Member

    Hello everyone,

    Just took possession of a brand new A/A S510 Extra FAC .25 from PA.  

    First off, the rifle exceeded my expectations tenfold with respect to fit/finish and ofcourse, accuracy. 

    *About 100 shots in, the rifle purged itself of all air in the tube – (all of a sudden).

    I read one of the blogs on PA regarding this issue with PCPs, so barely managed to charge it up – then dry fired 10 shots.  Re-charged and then no more leak.  60 shots later same thing occurred again, but this time it was when I was getting below 100B on air.  This obvoiusly throws a wrench into confidence with the rifle.

    2 Questions:

    1) Has anyone else on here had same issue with sudden purge of cylinder?

    2) Do Air Arms rifles "auto-purge" if you shoot until the pressure gets to a certain low point?

    I have only had the rifle a week and would love to NOT need sending it back for an exchange, but instinct tells me possible lemon.   Your thoughts greatly appreciated –

    Best regards,

    Scott

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    spysir
    Participant
    Member

    Factory design. All the AA 4xx/4xx wil dump all air if shot too low on pressure.

     

    John

     

    edit- no idea how you could get that many shots on a fill but…….)

    • This reply was modified 2 months ago by spysir.
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    Hubertus
    Participant
    Member

    backup the hammer spring adjuster and try it again.

    there should be just too much spring tension on the valbe if not cocked.

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    Glem.Chally
    Participant
    Member

    I would top it off around 140 bar or so,  you can damage some guns shooting it below 100 bar.

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    Nainoa88
    Participant
    Member

    Thanks guys,

    For John – i WISH i could get 100 shots on a fill!  The 100 shot reference was on fill #3 (I think)

    For Hubertus – since rifle is new and still "returnable," i am hesitant to get after the hammer, there is no outer adjustment on the S510 that I am aware of?  Not sure how to proceed if I achieve IPA courage and make a go at it.

    Glem.Chally – thanks, I will follow that recommendation.  From what i experimented with on Saturday, that would afford 2 mags/20 accurate shots out to 100yrds – for me – accurate = hitting clay pidgeon sized target at 100.  someday i'll hopefully tighten that up a bit.  This was with JSB 25.39's.

    *If the rifle dumps on me again this week its going back.  That would be unfortunate because it is purely awesome when not purging air.

    Best,

    Scott

     

     

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    mmahoney
    Participant
    Member

    My S510 did this exact thing. It would suddenly dump all air shortly after a fill. Would scare the crap out of me. It ended up being the fill valve would suddenly open up and dump the air. I ended up replacing the fill valve for about 30 bucks (no warranty) and it has been back to perfect since.

    When inspecting the old valve I could not find anything wrong with it. I had already tried replacing the o-ring and valve spring to no avail. Not sure what the real problem was with the old valve.

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    Michael
    Keymaster
    Keymaster

    What pressure are you filling to?  60 shots sounds wayyy too high for that rifle in .25 caliber.  My best guess is that you're dropping well below the regulated pressure and there isn't enough pressure to hold something closed.  These are the specs on PA's site:

    • XS = 30 shots in .25
    • XS Xtra = 40 shots in .25

    I've reached out to Air Arms to see if they have any further insight.

    -Michael

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    Nainoa88
    Participant
    Member

    Mmahoney – appreciate the info.  Part ordered.  

    Best regards,

    Scott

     

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    Nainoa88
    Participant
    Member

    Michael – I was into two mags (20 shots) when the first "disturbance" suddenly occurred.

    The second time it occurred, i pressed the issue (not knowing about the decreased pressure/too many shots = cylinder dump) and was probably closing in on 40 shots, so knowing what i know now, it was prob the pressure decrease. 

    I greatly appreaciate your simplified description above "dropping well below the regulated pressure and there isn't enough pressure to hold something closed." 

    BTW, for an un-regulated rifle i am pretty impressed by the consistency of POI vs shot count.  At 50yds / 30 shots there is no change to POI, then the descent gradually begins as one would expect.  I have another .25 (Hatsan BB) that thows in the towel after 18 shots.  It doesnt dump air, but is no where near as consistent and accurate as the A/A.

    Many thanks!

    Best regards,

    Scott

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    Nainoa88
    Participant
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    Sorry forgot to answer your Q – 'was filling to approx 180-190 bar from a tank

     

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    bdzjlz
    Participant
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    Beautiful rifle as I owned one that was deadly accurate.  Never shot it more than 35 shots or so without topping it off.  Not one issue.  Don’t know how one would expect that many shots in a.25 caliber.

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    skeptic
    Participant
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    As stated earlier, the rifle has to have enough back pressure to hold the fill valve closed. I have the ultimate sporter version in .22 (unregulated). Mine will do the same thing if I let the pressure drop too low. On highest power, I can go for about 5 – 6 magazines (50 – 60 shots) maximum before this happens. In .25 caliber, I would expect that number to be lower. I usually refill before that point to keep the poi drop manageable.

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    Outback
    Participant
    Member

    I have found the dump air thing is due to the valve not seating in the valve body , the same is when you fill from empty it is recommended to cock the rifle to take the pressure of the valve seating which is a lot of pumping to seat the valve from empty if the rifle had a catch to hold the hammer back when fired like the Hatsan it wouldn't happen . I always fire the Hatsan to retain the hammer to save the storage leak .

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    John_in_Ma
    Participant
    Member

    Most of the 4xx abd 5xx will dump through the valve below 100bar. It's how the valve is designed. Fill to 200bar, shoot down to 120bar. There is nothing wrong with your gun. You are shooting it too low on pressure.

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    Outback
    Participant
    Member

    😎

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    Nainoa88
    Participant
    Member

    Bdzjlz – incredibly, the .25 acheives 35 shots per fill before it starts to drop off (at 50 yards).  My .25 Hatsan only goes 18 before things get caddywampus in the accuracy department…

     

    Skeptic, Outback and John in MA – thanks for your feedback!  John in MA your second validation in this thread (that the purge at low pressure is a normal thing with this rifle) definetly saved my week.

    THANK YOU ALL and Best regards,

    Scott

     

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