Check-Mate Sig Sauer P938 7 Round 9mm Magazine. Manufactured from durable steel, this magazine is designed by Check-Mate Industries for the Sig Sauer P938 and Springfield 911 model pistols chambered in 9mm. This magazine features a polished, stainless finish and boasts a capacity of 7 rounds of 9mm cartridges. Each Check-Mate magazine is 100% developed and manufactured in the U.S.A., to ensure superior performance, reliability, quality, fit, and finish with your favorite firearm.