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  1. I

    Huma fx slug power tune kit

    No problem I am happy I could be of some help to you, good shooting and have fun with it.
  2. I

    Huma fx slug power tune kit

    I think you should try the Fx M3 Power block/Power Plenum Upgrade Kit I think that might solve it all but it's in pre-order at the moment. I have been researching it and it look great if you don't mind installing it. Once I get my next paid check it's the first thing I am ordering.
  3. I

    Huma fx slug power tune kit

     wrote:
  4. I

    Huma fx slug power tune kit

    I tried to understand that too about not using to ball and new spring. I think the reason is the new spring is not as strong as the stock spring. I have watched a few videos on the topic and that's what they say. The ones running the 600mm barrels use the stock spring in order to have Shortier...
  5. I

    Huma fx slug power tune kit

    Hi I have the m3 600mm. I am shooting .30cal slugs at 47.5gr and 54.7gr. I was think of going with the huma kit too. I think it's great I am still doing my research on it first. i decided to go with the carbon fiber liner, the .30cal 600mm superior heavy barrel, and the carbon fiber barrel tuner...