Are you wanting to remove it and put a newer one in ie longer release button?
Is it broke and it needs to be replaced?
Switch it from right to left handed release?
Just did a search on the web for the direction on how to replace the mag button. There are none written or video that I can find, Googled and Yahooed, normally if one does not find what I need the other does but in this case they both drew blanks.