The Colt 1911 Full Size Government/Commander magazine is a standard factory replacement magazine. This magazine is designed to be compatible with 1911 full size government/commander models chambered in the popular .45 ACP cartridge holding 7 rounds of ammunition. The magazine is made from high quality carbon steel and features a very nice blued finish. The most important aspect of this magazine is the fact that it is made by Colt so you can rest assured that the magazine will meet and exceed the specifications and tolerances set forth by the factory engineers.