something info on internal modification
you can file(磨) away the sharp corner pointed by the BLUE arrow, this should stop the bolt stretching the brass cylinder which is the cause of the production of metal dust inside the bolt
if you want to reduce the power of your M4 the valve (pointed by the ORANGE arrow) is the part you need to replace, I have already change it to a customize one with 2x 4mm holes
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本帖最後由 -l- 於 13-12-2008 20:33 編輯 ]