The Glock Extended Magazine Release a.k.a Glock EMR for all full-frame 9mm Glocks ( 17-45 ) is CNC Machined from aerospace-grade aluminum and merges flawlessly with the ergonomics and styling of your Glock handgun. In addition to functioning exactly like an OEM release the profile of our Glock Extended Mag Release is slightly raised with chamfered edges which helps ensure that you eject your Glock magazine quickly and with ease.