Constructed in the USA using the finest equipment and tooling, the bodies of these magazines are built of heat-treated carbon steel (FNH models constructed of rugged military spec polymer). State-of-the-art polymer followers ensure dependable feeding. Chrome silicon magazine springs deliver years of reliable service. Each magazine is backed by a lifetime warranty, so you can count on them to perform in your rifle or pistol. Discover why ProMag™ magazines are the choice of U.S. military and NATO units around the world. Made in USA. Per each.