I'm gonna guess that it would move it to the handle, as it also comes with a length of wire, which you wouldn't need if it moved it into the stock 
As for the EBR.... Nooooooo! Don't do it to your self dude, they weigh a feking ton, your day jobs hard enough, don't make yourself miserable on your fun time too, 90% of the guys over here who have either bought or converted one, at great cost, have sold it on after only a couple of games, for a complete loss, purely because its to heavy
As for the EBR.... Nooooooo! Don't do it to your self dude, they weigh a feking ton, your day jobs hard enough, don't make yourself miserable on your fun time too, 90% of the guys over here who have either bought or converted one, at great cost, have sold it on after only a couple of games, for a complete loss, purely because its to heavy