ASC's stainless steel magazines are an improvement on a classic, with the highest levels of durability and increased longevity. ASC's magazines are manufactured 100% start to finish in the USA using .020 gauge 410 stainless steel alloy, heat treated for superior strength and lasting endurance. ASC magazines are chemically treated for corrosion resistance and coated with a proprietary finish - Marlube, a wear-in not wear-off coating, that burnishes into the surface providing self-lubricating properties.