Things You'll Need
Instructions
Make sure that your Glock 27 pistol is unloaded and remove the magazine.
Remove the floor plate from the bottom of the magazine by inserting the end of your screwdriver into the hole located near the front of the floor plate and pressing in until you feel the plate release. The plate will slide slightly forward when released.
Slide the plate forward and off the magazine. Place your thumb over the plate to prevent the magazine spring from escaping.
Place the internal part of the magazine extension onto the spring, wide side forward, and press down the spring so it is below the lip of the magazine.
Slide the magazine extension onto the bottom of the magazine in the same way that the floor plate had been attached. You will hear an audible click when the extension locks into place.