ProMag Industries FNH-A9 High-Capacity Magazine offers unmatched reliability and durability for your firearm. Engineered with advanced materials and robust construction methods, this magazine ensures consistent performance in every situation. Constructed from a unique combination of heat-treated high carbon steel and durable polymer, it combines the best of both worlds. Every ProMag magazine is designed for optimal functionality and is backed by a lifetime guarantee. Drum housing constructed of a proprietary DuPont Zytel based polymer Magazine upper tower features a full-length steel internal insert, stamped and welded like the factory version Injection molded magazine follower for smooth loading Magazine spring made from heat-treated stainless steel for longevity Made in the USA for top-tier quality Choose ProMag for a magazine that delivers performance, reliability, and American craftsmanship.