Things You'll Need
Instructions
Hold the magazine upside down and place your screwdriver in the hole, near the front of the floor plate on the bottom of the magazine. Press down with your screwdriver until the floor plate releases and slides slightly forward.
Slide the floor plate forward and off the magazine. While removing the floor plate, keep your thumb over the end of the magazine to prevent the magazine spring from escaping.
Place the internal piece of the extension onto the magazine spring and press it down so that it is below the sides of the magazine. Slide the external piece of the magazine extender onto the front on the magazine, where the original floor plate was, until it locks into place.