This 50-round drum magazine is designed for HK MP5 and PTR9 9mm platforms, delivering high-capacity performance with rugged durability. Built using advanced materials and reinforced components, it ensures reliable feeding and long-lasting use in demanding shooting environments. Product Details Capacity: 50 rounds Compatibility: HK MP5 / PTR9 9mm rifles Material: DuPont Zytel based polymer drum housing Made in the USA Product Features High-capacity drum design for extended shooting sessions Reinforced upper tower with over-molded, heat-treated carbon steel feed lips Injection molded follower for smooth, consistent feeding Heat-treated stainless steel spring for durability and reliability Impact-resistant polymer construction for long service life