Ammunition Storage Components AR-15 6mm ARC 10 Round Rifle Magazine. Stainless steel body (410 stainless steel), heat treated for strength. Marlube coating options provide durability and lubricity. Features include chrome silicon springs, enhanced anti-tilt polymer followers with PTFE, and a 300 series stainless steel floor plate with black oxide coating for corrosion resistance. Caliber: 6mm ARC. Capacity: 10 rounds. Compatible with AR-15, M4, M16. Package contents: Ammunition Storage Components AR-15 6mm ARC 10 Round Rifle Magazine; 410 Series Stainless Steel Body, Heat Treated; Chrome Silicon Springs; Enhanced Anti-tilt Polymer Followers with PTFE; 300 Series SS Floor Plate with Black Oxide Coating for Corrosion Resistance.