ASC Stainless Steel magazines are an improvement on a classic, with the highest levels of durability and increased longevity, simply the best in the industry! Our magazines are manufactured 100% start to finish in the USA using .020" gauge 410 Stainless Steel Alloy and heat treated for superior strength and lasting endurance. Our magazines are chemically treated for corrosion resistance [ref. AMS QQ-P-35]. 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