The ZEV Technologies Fits Glock 3rd Gen.(9mm/40SW/357SIG) Stainless Extended Magazine Release is easy to install and Machined from Billet Aluminum then Hard Anodized. This magazine release is a must for any Glock owner. CNC Aircraft Quality Billet Aluminum. Black Hard Anodize Mag-release body. Textured button face. Black Hard Anodize button or Silver un-anodized button. Drop in replacement. ZEV Parts always incorporate design, feel and performance.