Check-Mate Full Size 1911 7 Round .45 ACP USGI Magazine, Black. Manufactured from durable steel, this USGI-style magazine is designed by Check-Mate Industries for full-size 1911 pistol platforms chambered in .45 ACP. This magazine features a matte-blued finish and boasts a capacity of 7 rounds of .45 ACP 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.