M1911 pistol
The Colt M1911 is a single-action, recoil-operated, semi-automatic pistol chambered primarily for the.45 ACP cartridge.
History
Early history and adaptations
The M1911 pistol originated in the late 1890s as the result of a search for a suitable self-loading pistol to replace the variety of revolvers in service at the time. The United States was rapidly adopting new firearms; several new pistols and two all-new service rifles, as well as a series of revolvers by Colt and Smith & Wesson for the Army and Navy, were adopted within this decade, alone.The next decade would see a similar pace, including the adoption of several more revolvers and an intensive search for a self-loading pistol that would culminate in the official adoption of the M1911 after the turn of the decade. Hiram S. Maxim had designed a self-loading rifle in the 1880s, but was preoccupied with machine guns. Nevertheless, the application of his principle of using recoil energy to reload led to several self-loading pistols in 1896. The designs caught the attention of various militaries, each of which began programs to find a suitable one for their forces. In the U.S., such a program would lead to a formal test at the turn of the 20th century.
During the end of 1899 and into 1900, a test of self-loading pistols was conducted, including entries from Mauser, Mannlicher, and Colt. This led to a purchase of 1,000 DWM Luger pistols, chambered in 7.65mm Luger. During field trials, these ran into some problems, especially with stopping power. Other governments had made similar complaints. Consequently, DWM produced an enlarged version of the round, the 9×19mm Parabellum with fifty weapons chambered for it tested by the U.S. Army in 1903.
American units fighting Tausūg guerrillas in the Moro Rebellion in Sulu during the Philippine–American War using the then-standard Colt M1892 revolver,.38 Long Colt, found it to be unsuitable for the rigors of jungle warfare, particularly in terms of stopping power, as the Moros had high battle morale and often used drugs to inhibit the sensation of pain.
The U.S. Army briefly reverted to using the M1873 single-action revolver in.45 Colt caliber, which had been standard during the late 19th century; the heavier bullet was found to be more effective against charging tribesmen. Problems prompted General William Crozier, the Chief of Ordnance, to authorize further testing for a new service pistol.
Following the 1904 Thompson-LaGarde pistol round effectiveness tests, Colonel John T. Thompson stated that the new pistol "should not be of less than.45 caliber" and would preferably be semi-automatic in operation. This led to the 1906 trials of pistols from six firearms manufacturing companies.
Of the six designs submitted, three were eliminated early on, leaving only the Savage, Colt, and DWM designs chambered in the new.45 ACP cartridge. These three still had issues that needed correction, but only Colt and Savage resubmitted their designs.
There is some debate over the reasons for DWM's withdrawal—some say they felt there was bias and that the DWM design was being used primarily as a "whipping boy" for the Savage and Colt pistols, though this does not fit well with the earlier 1900 purchase of the DWM design over the Colt and Steyr entries. In any case, a series of field tests from 1907 to 1911 were held to decide between the Savage and Colt designs. Both designs were improved between each round of testing, leading up to the final test before adoption.
Among the areas of success for the Colt was a test at the end of 1910 attended by its designer, John Browning. Six thousand rounds were fired from a single pistol over the course of two days. When the gun began to grow hot, it was simply immersed in water to cool it. The Colt gun passed with no reported malfunctions, while the Savage designs had 37.
Service history
Following its success in trials, the Colt pistol was formally adopted by the Army on March 29, 1911, when it was designated "Model of 1911", later changed in 1917 to "Model 1911", and then "M1911" in the mid-1920s.The Director of Civilian Marksmanship began manufacture of M1911 pistols for members of the National Rifle Association of America in August 1912. Approximately 100 pistols stamped "N.R.A." below the serial number were manufactured at Springfield Armory and by Colt.
The M1911 was formally adopted by the U.S. Navy and Marine Corps in 1913. The.45 ACP "Model of 1911 U.S. Army" was used by both U.S. Army Cavalry troops and infantry soldiers during the United States' Punitive Expedition into Mexico against Pancho Villa in 1916.
The M1911 officially replaced a range of revolvers and pistols across branches of the U.S. armed forces, though a number of other designs have seen use in certain niches.
Designation changes
The pistol's formal U.S. military designation as of 1940 was Automatic Pistol, Caliber.45, M1911 for the original model adopted in March 1911, and Automatic Pistol, Caliber.45, M1911A1 for the improved M1911A1 model which entered service in 1926.The designation changed to Pistol, Caliber.45, Automatic, M1911A1 in the Vietnam War era.
Replacement
At the end of hostilities, the government cancelled all contracts for further production and made use of existing stocks of weapons to equip personnel. Many of these weapons had seen service use, and had to be rebuilt and refinished prior to being issued.From the mid-1920s to the mid-1950s thousands of 1911s and 1911A1s were refurbished at U.S. arsenals and service depots. These rebuilds consisted of anything from minor inspections to major overhauls.
Pistols that were refurbished at government arsenals will usually be marked on the frame/receiver with the arsenal's initials, such as RIA for Rock Island Armory or SA for Springfield Armory.
By the late 1970s, the M1911A1 was acknowledged to be showing its age.
Under political pressure from Congress to standardize on a single modern pistol design, the U.S. Air Force ran a Joint Service Small Arms Program to select a new semi-automatic pistol using the NATO-standard 9mm Parabellum pistol cartridge.
After trials, the Beretta 92S-1 was chosen. The Army contested this result and subsequently ran its own competition in 1981, the XM9 trials, eventually leading to the official adoption of the Beretta 92F on January 14, 1985.
Despite that, the M1911A1 has never been completely phased out. Modernized derivative variants of the M1911, such as the M45 MEU and the M45A1 CQBP, as are still in use by some units of the US Armed Forces.
Design
Browning's basic M1911 design has seen very little change throughout its production life.Operation
The basic principle of the pistol is recoil operation.As the expanding combustion gases force the bullet down the barrel, they give reverse momentum to the slide and barrel which are locked together during this portion of the firing cycle. After the bullet has left the barrel, the slide and barrel continue rearward a short distance.
At this point, a link pivots the rear of the barrel down, out of locking recesses in the slide, and the barrel is stopped by making contact with the lower barrel lugs against the frame.
As the slide continues rearward, a claw extractor pulls the spent casing from the firing chamber and an ejector strikes the rear of the case, pivoting the casing out and away from the pistol through the ejection port.
The slide stops its rearward motion then, and is propelled forward again by the recoil spring to strip a fresh cartridge from the magazine and feed it into the firing chamber.
At the forward end of its travel, the slide locks into the barrel and is ready to fire again.
However, if the fired round was the last in the magazine, the slide will lock in the rearward position, which notifies the shooter to reload by ejecting the empty magazine and inserting a loaded magazine, and facilitates reloading the chamber, which is accomplished by either pulling the slide back slightly and releasing, or by pushing down on the slide stop, which releases the slide to move forward under spring pressure, strip a fresh cartridge from the magazine, and feed it into the firing chamber.
Composition
Other than grip screws there are no fasteners of any type in the 1911 design.The main components of the gun are held in place by the force of the main spring. The pistol can be "field stripped" by partially retracting the slide, removing the slide stop, and removing the barrel bushing.
Full disassembly of the pistol to its component parts can be accomplished using several manually removed components as tools to complete the disassembly.
Safety
The military mandated a grip safety and a manual safety. A grip safety, sear disconnect, slide stop, half cock position, and manual safety are on all standard M1911A1s.Several companies have developed a firing pin block safety. Colt's 80 series uses a trigger-operated one, and several other manufacturers, including Kimber and Smith & Wesson, use a Swartz firing-pin safety, which is operated by the grip safety.
Language cautioning against pulling the trigger with the second finger was included in the initial M1911 manual and later manuals up to the 1940s.
Calibres
In addition to the.45 ACP, M1911 models chambered for.455 Webley Auto,.38 Super, 9×19mm Parabellum, 7.65mm Parabellum, 9mm Steyr,.400 Corbon, and other cartridges were offered.The M1911 was developed from earlier Colt semi-automatic designs, firing rounds such as.38 ACP.
Interwar changes
Battlefield experience in World War I led to some more small external changes to the M1911, completed in 1924.The new version received a modified type classification, M1911A1, in 1926 with a stipulation that M1911A1s should have serial numbers higher than 700,000 with lower serial numbers designated M1911.
The M1911A1 changes to the original design consisted of a shorter trigger, cutouts in the frame behind the trigger, an arched mainspring housing, a longer grip safety spur, a wider front sight, a shortened hammer spur, and simplified grip checkering.
These changes were subtle and largely intended to make the pistol easier to shoot for those with smaller hands. No significant internal changes were made, and parts remained interchangeable between the M1911 and the M1911A1.