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Grap a punch or a round of 223. depress the magazine release no the right in so its flush with the lower or as much as it will go. Now on the left, the catch should be sticking out past the left side of the receiver. Rotate it off and away from the receiver and prestro.
First post after the "lower parts" pic, shows how to install the mag release. Just do it in reverse. (Sorry I'm a visual kinda guy) http://www. ar15.com/forums/topic.html?b=3&f=4&t=226782