The Duramag® AR-15 6.8mm SPC 5-Round Stainless Steel Magazine features a premium 400-series stainless steel body with a proprietary T-360™ Teflon coating to deliver smooth performance and lasting corrosion resistance. The chrome-plated steel spring, coupled with an Advanced Geometry Follower™ and enhanced interior and exterior geometries ensure reliable feeding performance. Plus, this magazine is crack-, swell-, and crush-proof for superior durability.