The Magpul GL L-Plate fits the PMAG 17 GL9 and PMAG 15 GL9, and is made of durable reinforced polymer with a rubber overmold. Tailor-made for competition or defensive use, the GL L-Plate is designed to aid in seating of the magazine into extended magazine wells and to provide positive traction and impact protection without unnecessary bulk. Installs easily without tools. Three per pack. Made in the USA.