The ZEV Technologies Extended Magazine Release is CNC milled entirely out of high quality Aircraft Grade Aluminum then Hard Anodized for durability. Both the magazine release button and the magazine release are aluminum; this is not a large button attached to a factory plastic release like other products on the market. The mag button is oversized so you can access it without shifting your grip but shaped in such a manner that it does not interfere with your shooting grip. DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.