I was just looking at my G&G GR300, the mag release looks like you have to push it as far in as you can (as if releasing a mag) and unscrew the catch part.
In other words it looks as though the "button" screws onto the shaft of the "catch".
Bloody wierd if you ask me.
Team Bad Karma(BK-09)
CAUTION: Evil Genius at Work
Those that wear the "Tin Foil Hat" stand on guard for thee. All others stand on guard for themselves.