KM4A1 inner barrel swap.

Discussion in 'Gun Building, Modifications & Repairs' started by Scariestwalnut, Nov 18, 2012.

  1. Scariestwalnut

    Scariestwalnut New Member

    1
    0
    Ch√Ęteauguay
    Hello everyone, I have recently wanted to change my KWA M4 inner barrel. I first hit an obstacle since the stock inner barrel was glued in there -_- I bought a 6.03mm madbull. Installed it and went from +- 400fps to about 260fps. Any idea about what could have possibly done that? Help me please.
     
    Last edited: Nov 18, 2012
  2. iTunesTomato

    iTunesTomato New Member

    2,124
    0
    Oakland
    Um.. glued in? Really?
    Thats a bit odd.. is KWA doing that now?
    And whats the length of the barrel you bought?
     

  3. CoppertopNeasg

    CoppertopNeasg New Member

    1,440
    2
    Boston
    Check your hop-up unit. That's the only place there could be an issue unless you bent your barrel.