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Thread: Xisico B9 Stock Removal

  1. #11
    Spilled Milk
    Guest
    Ok, so all I did was replace the Leather Piston Seal with the nylon Replacement Seal in the QB-57 maintence kit. http://scopesandammo.com/storefront/...pair-kit-p-858 I did not change the Mainspring. I sanded the Nylon Seal around the edges a bit so it was smoother fit. (Still nice and tight though.) Here are the numbers:

    Crosman - Domed - 7.8 gr - 572 fps
    Premier - Hollow Point - 7.8 gr - 579 fps
    Gamo - Red Fire - 7.8 gr - 571 fps
    Crosman - Penetrator - 8.5 gr - 510 fps
    Stoeger - X Speed - 5.56 gr - 600 fps
    Predator - Polymag - 8 gr - 548 fps
    RWS - Hyper Velocity - 5.2 gr - 680 fps!
    Gamo - Lead BB - 8.18 gr - 474 fps
    Diablo - Jumbo Monster - 13.43 gr - 379 fps

    The same mod might also could have been done by simply cutting 1/4" off the original Leather Seal. The gun fires way smoother now and it is easy to cock as well. Gonna paint the polymers olive drap and call it a night. (post a pic in the gallery) Anyways, hope this info was good for the forum. See you on the next mod.

  2. #12
    Administrator AirGunEric's Avatar
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    Leather seals never did do a great job- they drag more on the tube walls (i.e. braking the piston somewhat) and didn't necessarily seal optimally- so part of this may be the actual seal replacement itself.
    I'd say I care- but I'd probably be lying...


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