How take apart mec gar 10 roung mag

[Gun Fever]

HOw the hell do i take apart this mag??? i stuck a small screw driver down the hole in the bottom until the spring "clicked" but nothing the floor plate doen't even budge???

 

[FIVETWOSEVEN]

May require some more force. I have one that came with my gun and all I do is stick something in that hole and press down and slide the oversized floorplate off.