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    Umarex Umarex Notos return spring.

    I'm actually getting the porting done now. Btw is that a 700 mm barrel on your Notos? If so I can you DM me where I can get one?
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    Plenum Volume Confusion

    So just an FYI, this is a non linear problem. If you've taken a differential equations you can relate this to a tank mixing problem. The other thing to remember is you are dealing with a compress able fluid. Not water. When you up the pressure of air, the amount of air does not scale linearly...
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    Umarex Umarex Notos return spring.

    Hi all, Quick question, any body have any experience with modifying the return spring on the umarex Notos poppet valve? Im trying to maximize volume of air (extended barrel) to push some slugs hard. Any suggestions on a good replacement spring? If I have to take material off the spring how...