Featuring a premium heat-treated steel body with a proprietary T-360™ Teflon coating, the Duramag® AR-15 .400 Legend 10-Round Magazine is an affordable aftermarket rifle magazine designed to deliver superior reliability and consistent performance in hunting and target shooting applications. Built to withstand virtually any shooting environment, this magazine is crack-, swell-, and crush-proof for superior durability. The chrome-plated steel spring, coupled with an Advanced Geometry Follower™ and enhanced interior and exterior geometries ensure reliable feeding performance when it matters most.