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Thread: BSA Airsporter - Stuck piston

  1. #1
    Marksman

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    Default BSA Airsporter - Stuck piston

    Hi All,

    I got my hands an Airsporter(MK7) that would not cock. I disassembled the rifle, and now I cannot get that piston out. I soaked it overnight with Q 20, tried again, and it would not budge.
    I jumped on it with all my weight, but it keeps on laughing in my face.

    What other methods can I try?
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  2. #2
    Sharp Shooter

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    Hello,

    You could try heating the outside of the compression tube with a hair dryer or heat gun.....

    Cheers.
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  3. #3
    Marksman

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    I had the same problem a while back. The o-ring is the wrong size. I resorted to gently heating the tube with a hot airgun and pounding the piston out using a steel rod down the barrel you will have to repeat the process a number of times. Once you have the piston out you'll need to polish the compression chamber to get the residue gunk out. Good luck
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  4. #4
    Marksman

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    Thank you for your advise. I got the piston out with some heat from the wife's hear dryer.
    I made contact with Vrystaat for some spares, so will hopefully get her shooting soon.
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  5. #5
    Sharp Shooter

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    Quote Originally Posted by Njappers View Post
    Thank you for your advise. I got the piston out with some heat from the wife's hear dryer.
    I made contact with Vrystaat for some spares, so will hopefully get her shooting soon.

    And? Sorted?
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  6. #6
    Marksman

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    I got the rifle shooting again after making my own buffer washer and tap shim. Sourced tap spring from an old lighter.
    The rifle is not shooting well though. It shoots 5 to 7cm low at 10m. I think it needs a main spring replacement. I screwed the cylinder and trigger housing in by hand without difficulty.
    The tap lever is broken, and the tap shim I made will not last. I need these parts, but Adriaan is not getting back to me.

    Who else will be able to help with parts?

    Thanks,
    Njaps
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  7. #7
    Marksman

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    I got this rifle shooting nicely. Good tight groups at 10m. Replaced the spring with a shortened universal spring. Took a couple of attempts before it felt right. It still vibrates quite a lot though. I am sure it will run in with time.

    On another point...I was fortunate to get my hands on a .22 Airsporter in great condition. It had a broken spring. I bought another universal spring, but this one had a thicker wire than the other and the original. It fitted in the piston so I gave it a go like before. The problem I have now is that I cut 10 coils off already, and she still kicks like a mule. Very difficult to cock too. How short can I really go? I tried to find a spring with the original springs specks, but no luck.

    Should I forget about mending other springs to fit, or is there a place in Pretoria with a better selection of springs to choose from?

    Regards,
    Njaps
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  8. #8
    Sharp Shooter

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    Good evening...I have an old tect document that mentions spring sizes and coils.
    What it says for Airsporter is the following:
    OD 20mm
    ID 15mm
    coil thickness 3mm
    lentgh 270mm
    coils 29 - 32

    Hope this helps
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