Editing M1911 pistol (section)

=== Calibres ===
In addition to the .45 ACP (Automatic Colt Pistol), M1911 models chambered for [[.455 Webley|.455 Webley Auto]], [[.38 Super]], [[9×19mm Parabellum]], [[7.65mm Parabellum]], [[9mm Steyr]],<ref>{{cite web |author=Wiley Clapp |title=The 1911: Not Just a .45 |url=http://www.americanrifleman.org/articles/the-1911-not-just-a-45/ |url-status=live |archive-url=https://web.archive.org/web/20130811021831/http://www.americanrifleman.org/articles/the-1911-not-just-a-45 |archive-date=2013-08-11 |access-date=2013-08-25 |work=American Rifleman}}</ref> [[.400 Corbon]], and other cartridges were offered. 

The M1911 was developed from earlier [[Colt's Manufacturing Company|Colt]] semi-automatic designs, firing rounds such as [[.38 ACP]].