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Thread: the power adjustment on the Air Arms S400 - S410 secret

  1. #1
    Marksman
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    Default the power adjustment on the Air Arms S400 - S410 secret

    I have had a number of conversations with guys on the phone that had "read" that the power adjustment on the Air Arms S400-S410 has a weakness in that it could be bumped of moved by accident thus messing up the way the gun was sighted in. As most of you know, the power adjustment knob is NOT a simple Hi-Medium-Low type of adjustment. It is a LOT more robust than that and works like a rheostat on a light switch in that you can turn the knob from full (22 fpe) down to 5 fpe and stop wherever you want. There are no "clicks" when you adjust the power. The knob just turns smoothly and you stop it wherever you wish.
    BUT the rumors and reports are wrong. If you remove the stock (just a couple of screws) and look just about an inch under the power adjustment knob, you will see a hole with a small recessed allen screw. That screw allows you to "lock" the power adjustment knob so it can't move. So all a guy has to do is find the power level you want, then tighten the little allen screw and there will be no shifting, moving or altering unless you loosen the screw later and change the power yourself. Just thought I'd pass this tidbit along to set the story straight.
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  2. #2
    Sharp Shooter
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    thanks Guido! good to know.
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  3. #3
    Sharp Shooter

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    Guido it's nice to have guys like yourself on the forum , who supply these usefull titbits of info, to the other members, who perhaps do not have the necessary skill or experience in these matters.
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  4. #4
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    JTK, look at the power adjustment knob on your ERB, that's the best solution.
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  5. #5
    Sharp Shooter
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    nie nou seker nie spyker? ek weet van die groot silwer knop Ek het verstaan guido se skoefie lock die groot knop. Mag dalk help as mens FT skiet met die monster. Of verstaan ek verkeerd?
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  6. #6
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    Quote Originally Posted by JTK View Post
    nie nou seker nie spyker? ek weet van die groot silwer knop Ek het verstaan guido se skoefie lock die groot knop. Mag dalk help as mens FT skiet met die monster. Of verstaan ek verkeerd?
    Jip, kyk na die silver knop. daar is 'n locking grub screw in.
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  7. #7
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    Thanks for the advice, I need to do this for my old man's rifle. 410 Xtra, it's always annoyed me.
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  8. #8
    Sharp Shooter
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    aaa.. met jou.. dog die grub screw is om die knop aan te hou die die dat ek nog nie gedraai het aan hom nie !
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  9. #9
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    JTK,
    aren't you supposed to be busy making the targets instead of playing with the power settings of your gun?
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  10. #10
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    I didnt realise it was so easy to up the power on the S400...Just for interests sake... what kind of power could one extract without doing any damage.
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  11. #11
    Sharp Shooter
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    without replacing the spring on a standard I dont think one will get the max of about 20. maybe in the middle somewhere? Someone that has dont it may be able to answer.
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  12. #12
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    Quote Originally Posted by JTK View Post
    aaa.. met jou.. dog die grub screw is om die knop aan te hou die die dat ek nog nie gedraai het aan hom nie !
    Nope, ek het die knop altyd gelock op 12ft/lbs wanneer ek die geweer vir FT gebruik het.
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  13. #13
    Sharp Shooter
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    jip 12 is maklik om te kry. net so fraksie verby die eerste lyntjie. Ek dial hom sommer daar @ will nou dat ek weet waar hy moet wees. Het jy ooit getel hoeveel jy uitkry teen 800fps? Vir my lyk dit na n goeie 120-140 of so iets. jy skiet vir ewig.
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  14. #14
    Sharp Shooter

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    die gewone S400 gee omtrent 15fpe maks, 'n conversion na high power gee omtrent 22.5fpe (maar die powercurve is maar sleg)
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  15. #15
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    The adjustment you are all talking about is only on the FAC/ERB or am I missing something?
    How do you adjust the power on a standard S400?
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