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Right from the lips of MadBull - The Echo 1 M4 Dust cover.
To get a working dust cover takes a little work. I used the MadBull charging handle with a King Arms handle arm. The problem is with the King Arms handle arm stops closing of the body since the hump on the top of the arm gets in the way. Trim off the hump flush with the top (ungroved side) of the arm. The next part is to trim a little off the dust cover release. The King Arms one is to big and too thick. So mod the dust cover release little by little until it doesn't push on the gear box or hop-up but still has enough to push the dust cover release pin.
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