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Thread: BSA Airsporter Mk5 internals query

  1. #1
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    BSA Airsporter Mk5 internals query

    Stripped today 'cos piston was seized. As expected buffer crumbled and nylon head binding badly. Seems the fix requires alloy replacement head but for the mo' going to keep as found.
    Can anyone say what the steel piston ring is for? Thanks for looking.

  2. #2
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    Described as a scraper ring on the big supplier's site,no need for it.

  3. #3
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    deejayuu,

    The alloy head from Chambers comes with an O-ring that is far, far too big

    Luckily my friend had an O-ring in his 'odds & sods' box that gave the correct fit.

    The O ring position on the Chambers head seems far too far back from the nose of the head - IIRC about 15 mm - why they didn't put it just behind the nose I don't know.

    Have fun & a good weekend

    Best regards

    Russ

  4. #4
    look no hands's Avatar
    look no hands is offline Even better looking than a HW35
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    I've never seen a scraper ring like that before on any of the heads I've taken out but saying that I've never had one with a synthetic head either only alloy.

    Pete
    Far too many rifles to list now, all mainly British but the odd pesky foreigner has snuck in

  5. #5
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    I have had two bsa scorpion pistols with the same head.

  6. #6
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    Thanks all. Back together temporarily and output around 8 ft. lb. with Superdome. Original, as found, spring 3/4 tap washer buffer and near enough "O" ring from bits draw. That'll do nicely for now.
    Needs a cocking lever latch. Fragile synthetic thing.

  7. #7
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    Should you need to replace the o-ring the below may help.

    Standard o-ring is imperial BS212. These are often (well the three I've done...) very, very tight and power robbing. I find an imperial BS 211 works better.

  8. #8
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    Thanks Frog will look at that. Do you know dimensions please?

  9. #9
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    I have only seen the metal ring on the nylon heads.
    .22 Venom Mach 1 (FAC) 6-25x56 Millett.
    .22 Venom Mach 2 Thumbhole 6.5-20x40 Leupold EFR.
    .22 Venom Mach 2 Sporter 4-12x40 Leupold.
    .177 Venom Vantage 4-16x50.
    .177 Venom Daystate 8-32x56 AGS.
    .22 Venom Datstate 4-16x56 AGS.
    .22 Webley Venom FX2000 6-18x40 Busnel Legend.
    .177 Titan MPT by Steve Pope 6-24x40 Tasco.
    .177 Pro-Sport 4-16x50.
    .22 Webley FX2000 3-9x33 Leupold EFR.
    .177 Logan Solo 4-16x50.
    .22 HW90 (spring powered) 4-16x50
    .22 Gamo Stutzen.
    .177 Walther lever action.

  10. #10
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    Quote Originally Posted by deejayuu View Post
    Thanks Frog will look at that. Do you know dimensions please?
    Google is your friend!

    But

    BS212 ID = 21.82mm
    Section = 3.53mm

    BS211 ID = 20.22mm
    Section 3.53mm

  11. #11
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    Thanks again

  12. #12
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    Quote Originally Posted by Frog View Post
    Google is your friend!

    But

    BS212 ID = 21.82mm
    Section = 3.53mm

    BS211 ID = 20.22mm
    Section 3.53mm
    Excellent thank you.

  13. #13
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    Quote Originally Posted by deejayuu View Post
    Thanks again
    No worries

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