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.