The M1911 pistol is a semi-automatic handgun designed by John Browning and adopted by the United States Army in 1911. It is chambered for the .45 ACP cartridge, known for its stopping power. The M1911 features a single-action mechanism, meaning the hammer must be manually cocked for the first shot, and it has a magazine capacity of seven to eight rounds. This pistol has a reputation for reliability and accuracy, making it popular among military, law enforcement, and civilian shooters. The M1911 has undergone various modifications and remains in use today, with numerous manufacturers producing modern versions of this classic firearm.