So the answer is yes you do have to take the mag apart to make this shim. But it is really easy. There is only 2 set screws that hold the thing (not sure tech name for) that punctures the powerlet. Then it is easy from there. If u want I can make a short vid on how to make it work.
Edited by Darth Genesis, 13 December 2011 - 12:29 PM.