Designed by famous gun designer John Browning, the M1911 is the first pistol been used by all branches of U.S. military. Its eventually replaced in 1985, largely by Baretta M92, designated M9, along with Glock 17 and SIG Sauer P220 series. It is still produced by many companies today including Colt, Kimber, and Remmington. It is produced in both traditional design, and modern updated variants, including increased magazine capacity, and fiber optic sights and picantinny rail systems to mount more attachments. It is still frequently used in the American military, especially Special Operations units. It was first deployed by the US in the First World War and also saw service in all the theatres of WWII. It fired a .45 caliber ACP round (Automatic Colt Pistol) from a seven round detachable mag