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 the Glock handgun. In addition to functioning exactly like an OEM release, the profile of the Glock Extended Mag Release is slightly raised with chamfered edges helps ensure that you eject the Glock magazine quickly and with ease.