This was found in Crashlanding so it might only apply to that pack.
Using itemducts, impluse itemducts, and the Minefactory Reloaded ejector to pull from a block gate causes the block in front of the block gate to be put into the attached inventory but does not remove the block this allows infinite duping of any placeable block. Do yourself a favor and try out an infinite dynamite dropper with two block gates connected with an itemduct before you fix it.
Centax
commented
9 years ago 
This was found in Crashlanding so it might only apply to that pack.
Using itemducts, impluse itemducts, and the Minefactory Reloaded ejector to pull from a block gate causes the block in front of the block gate to be put into the attached inventory but does not remove the block this allows infinite duping of any placeable block. Do yourself a favor and try out an infinite dynamite dropper with two block gates connected with an itemduct before you fix it.