With twenty-four years of customer satisfaction, this design has proven reliability and 50% tighter tolerances than other military specification magazines. Same length as stock magazines with extra capacity and improved performance. This is the same design CMC supplies to America’s top 1911 manufacturers for use as factory standard in their pistols. Available in stainless and blued carbon steel materials. Since 1992, this line of .45 ACP magazines has never suffered from the common problem of cracked feed lips.