Development of selfloading pistols by Colt seems to have begun before 1900, while the specific designs that result in the M1911 was furthered from around 1904-05 onwards. Final designs tested at the end of 1910 decided between the Colt and its only rival (the Colt passing with no malfunctions where the opponent had almost 40). It was formally adopted in March 1911, hence the designation.
The Colt M1911 pistol was invented by John Browning(1855-1926).
John M. Browning.
The Colt M1911 was designed 1911.
M1911, M1911A1, Colt SAA
The Colt M1911, a semiautomatic pistol invented by John Browning, was first made in 1910, and subsequently adopted into service with the United States Army in 1911.
400-1000
Colt M1911
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The M1911 is the military designation for John M. Browning's .45 caliber automatic pistol. He was employed by Colt Firearms, so the patent gives credit to Colt for this firearm.
The Colt M1911 and the colt M1911A has only 1 caliber .45 or 45/100 of an inch. This round is also known as the colt .45 A.C.P. (all Colt pistols) It is a short round which differs from the .45 long round.
Colt has never produced a model M1911 that is powered by CO2.