Pheas Airsoft shows you how to swap sides for the KWA Ambidextrous Selector Flip... "Following a request, here is a short video to show how to change the selectors over from one side to the other....... Why you ask? Because they are different sizes and lefties who want to use it will enjoy / want to use the longer selector from the left side of the reciever instead of the shorter one that's on the right."