Check-Mate 2011 126mm 19 Round 9mm Magazine. Manufactured from durable steel, this 126mm magazine is designed by Check-Mate Industries for 2011 pistol platforms chambered in 9mm. This magazine features a stainless finish and boasts a capacity of 19 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.