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Thread: AA S400 Calibre Upgrade

  1. #1
    Sharp Shooter
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    Default AA S400 Calibre Upgrade

    A question to those in the know.....

    What parts / work will be required to upgrade a S400 FAC .177 to 5.5mm, other than the obvious i.e barrel?
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  2. #2
    Sharp Shooter
    The Professor

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    The bolt needs changing as well.
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  3. #3
    Sharp Shooter
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    Thanks, Dale.
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  4. #4
    Sharp Shooter
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    Will the tray/ loading groove not be too narrow as well? If so i suspect that might require some sort of machining, which may be quite difficult. Haven't had an S400 in ages so apologies if I'm wrong or it an easy swap.
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  5. #5
    Sharp Shooter
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    Quote Originally Posted by Macros View Post
    Will the tray/ loading groove not be too narrow as well? If so i suspect that might require some sort of machining, which may be quite difficult. Haven't had an S400 in ages so apologies if I'm wrong or it an easy swap.
    Unless AA have changed the design recently, no. The S400 single shot bolt housing was a common part with a groove machined for 5.5mm, the lead into the barrels controlled the feeding of the pellet.
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