The Zev Technologies Generation 4 Magazine Release for Glock pistols is a replacement magazine release constructed from aircraft grade aluminum and hard coat anodized for durability. The checkered non-slip face provides a more tactile engagement surface while the contact point on the release face is ergonomically angled to the rear to allow ease of manipulation in performig magazine changes. This Mag Release is easy to install, with the use of needle nose pliers and a long shaft, slim, flat head screwdriver. *Note: It is easiest to remove and replace the factory GlockA(R); Mag-release Catch Spring for the magazine release installation. Then installing it back in its pin position after you remove the factory unit and replace it with the ZEV(TM) component.* Compatibility: 4th Generation Glocks: 17, 19, 22, 23, 26, 27, 31, 32, 33, 34, 35, 37