Wilson Combat has been supplying serious shooters and professionals with the worlds' most reliable and durable .45 auto magazines for the past 30 years. They are used by the worlds' most Elite U.S. Army SPEC OPS unit, FBI SWAT, Thunder Ranch and professionals worldwide. The magazine bodies are manufactured from .025" (the thickest in the industry) aircraft grade certified 17-7 PH stainless steel and heat treated for maximum durability and service life.