Constructed of a proprietary polymer, these durable magazines fit 9mm Glock® handguns, including Gen 4 models. Reinforced feed lips, a stainless steel spring and a high visibility anti-tilt follower ensure reliable feeding. Pushbutton release on the floorplate allows the magazine to be easily disassembled without tools. Floorplate also has a pen dot matrix on the bottom for marking and identifying magazines. The GL9 consistently drops clear and free when released; loaded or empty. 17 GL9 fits flush at the base of the Glock® 17 grip, with some minor protrusion on compact and subcompact models. 15 GL9 fits flush on Glock®19, with some protrustion on subcompact pistols.