The Pro Mag drum replacement is designed to work seamlessly with your Glock 17/G19. Manufactured using the high-quality DuPont Zytel polymer, it guarantees durability and flawless function. The injection molded mag follower and the mag spring are meticulously formed from chrome silicone wire, ensuring its top-notch performance. This product is proudly made in the USA, symbolizing its adherence to quality and high-standard craftsmanship.