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The ArmaLite AR-15 is a
gas-operated Gas-operation is a system of operation used to provide energy to operate locked breech, Semi-automatic firearm, autoloading firearms. In gas-operation, a portion of high-pressure gas from the Cartridge (firearms), cartridge being fired is used t ...
assault rifle An assault rifle is a select fire rifle that uses an intermediate cartridge, intermediate-rifle cartridge and a Magazine (firearms), detachable magazine.C. Taylor, ''The Fighting Rifle: A Complete Study of the Rifle in Combat'', F.A. Moyer '' ...
manufactured in the United States between 1959 and 1964. Designed by American gun manufacturer
ArmaLite ArmaLite, or Armalite, is an American small arms engineering company, formed in the early 1950s in Hollywood, California. Many of its products, as conceived by chief designer Eugene Stoner, relied on unique foam-filled fiberglass butt/stock fur ...
in 1956, it was based on its
AR-10 The ArmaLite AR-10 is a 7.62×51mm NATO battle rifle designed by Eugene Stoner in the late 1950s and manufactured by ArmaLite (then a division of the Fairchild (aircraft manufacturer), Fairchild Aircraft Corporation). When first introduced in 1956 ...
rifle. The ArmaLite AR-15 was designed to be a lightweight rifle and to fire a new high-velocity, lightweight, small-caliber cartridge to allow infantrymen to carry more ammunition. In 1959, ArmaLite sold its rights to the AR-15 to Colt due to financial difficulties and limitations in terms of manpower and production capacity. After modifications (most notably, the charging handle was re-located from under the carrying handle like AR-10 to the rear of the receiver),Kokalis, Peter G
Retro AR-15
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Colt rebranded it the Colt 601, however, it still carried the Armalite markings due to contractual obligations to Armalite/Fairchild Aircraft Co. Colt marketed the redesigned rifle to various military services around the world and was eventually adopted by the U.S. military in January 1962 and subsequently designated as
M16 rifle The M16 (officially Rifle, Caliber 5.56 mm, M16) is a family of assault rifles adapted from the ArmaLite AR-15 rifle for the United States Armed Forces, United States military. The original M16 was a 5.56×45mm NATO, 5.56×45mm automatic ...
in December 1963, which went into production and service in 1964. Colt continued to use the AR-15 trademark for its line of semi-automatic-only rifles marketed to civilian and law-enforcement customers, known as
Colt AR-15 The Colt AR-15 is a product line of magazine-fed, gas-operated, semi auto rifle manufactured by Colt's Manufacturing Company ("Colt") in many configurations. The rifle is a derivative of its predecessor, the lightweight ArmaLite AR-15, an ...
. The Armalite AR-15 is the parent of a variety of Colt AR-15 and M16 rifle variants.


History

After World War II, the
United States military The United States Armed Forces are the Military, military forces of the United States. U.S. United States Code, federal law names six armed forces: the United States Army, Army, United States Marine Corps, Marine Corps, United States Navy, Na ...
started looking for a single automatic rifle to replace the
M1 Garand The M1 Garand or M1 rifleOfficially designated as U.S. rifle, caliber .30, M1, later simply called Rifle, Caliber .30, M1, also called US Rifle, Cal. .30, M1 is a semi-automatic rifle that was the service rifle of the United States Army, U.S. ...
, M1/M2 Carbines, M1918 Browning Automatic Rifle, M3 "Grease Gun" and Thompson submachine gun. However, early experiments with select-fire versions of the M1 Garand proved disappointing. During the
Korean War The Korean War (25 June 1950 – 27 July 1953) was an armed conflict on the Korean Peninsula fought between North Korea (Democratic People's Republic of Korea; DPRK) and South Korea (Republic of Korea; ROK) and their allies. North Korea was s ...
, the select-fire M2 Carbine largely replaced the
submachine gun A submachine gun (SMG) is a magazine (firearms), magazine-fed automatic firearm, automatic carbine designed to fire handgun cartridges. The term "submachine gun" was coined by John T. Thompson, the inventor of the Thompson submachine gun, to descri ...
in US service and became the most widely used Carbine variant. However, combat experience suggested that the .30 Carbine round was under-powered. American weapons designers concluded that an intermediate round was necessary, and recommended a small-caliber, high-velocity cartridge. However, senior American commanders having faced fanatical enemies and experienced major logistical problems during WWII and the Korean War, insisted that a single powerful .30 caliber cartridge be developed, that could not only be used by the new automatic rifle, but by the new
general-purpose machine gun A general-purpose machine gun (GPMG) is an air-cooled, usually belt-fed machine gun that can be adapted flexibly to various tactical roles for light and medium machine guns. A GPMG typically features a quick-change barrel design calibered fo ...
(GPMG) in concurrent development. This culminated in the development of the 7.62×51mm NATO cartridge. The United States Army then began testing several rifles to replace the obsolete M1 Garand. Springfield Armory's T44E4 and heavier T44E5 were essentially updated versions of the Garand chambered for the new 7.62×51mm NATO round, while Fabrique Nationale submitted their
FN FAL The FAL (, English: Light Automatic Rifle) is a battle rifle designed in Belgium by Dieudonné Saive and manufactured by FN Herstal and others since 1953. During the Cold War the FAL was adopted by many countries of the NATO, North Atlantic Trea ...
as the T48, and the British submitted their EM-2 rifle.
ArmaLite ArmaLite, or Armalite, is an American small arms engineering company, formed in the early 1950s in Hollywood, California. Many of its products, as conceived by chief designer Eugene Stoner, relied on unique foam-filled fiberglass butt/stock fur ...
entered the competition late, hurriedly submitting several
AR-10 The ArmaLite AR-10 is a 7.62×51mm NATO battle rifle designed by Eugene Stoner in the late 1950s and manufactured by ArmaLite (then a division of the Fairchild (aircraft manufacturer), Fairchild Aircraft Corporation). When first introduced in 1956 ...
prototype rifles in the fall of 1956 to the United States Army's Springfield Armory for testing.Pikula, pp. 36, 38 The ArmaLite AR-10 featured an innovative combination of a straight-line barrel/stock design, a new patent-filed gas-operated bolt, forged aluminum alloy receivers and with phenolic composite stocks resulting in a small arm significantly easier to control in automatic fire than other infantry rifles of the day. It had rugged elevated sights, an oversized aluminum
flash suppressor A flash suppressor, also known as a flash guard, flash eliminator, flash hider, or flash cone, is a device attached to the muzzle (firearms), muzzle of a rifle that reduces its Muzzle flash, visible signature while firing by cooling or dispersin ...
and recoil compensator, and an adjustable gas system.Pikula, pp. 27-30 The final prototype, featured an upper and lower receiver with the now-familiar hinge and takedown pins, and the charging handle was on top of the receiver placed inside of the carry handle. For a 1950s 7.62×51mm NATO rifle, the AR-10 was incredibly lightweight at only empty. Initial comments by Springfield Armory test staff were favorable, and some testers commented that the AR-10 was the best lightweight automatic rifle ever tested by the Armory.Pikula, pp. 39-40 In the end, the United States Army chose the T44, which entered service as the M14 rifle, which was an improved M1 Garand with a 20-round magazine and automatic fire capability. The U.S. also adopted the M60 general purpose machine gun (GPMG). Its NATO partners adopted the FN FAL and HK G3 rifles, and the
FN MAG The FN MAG (, , ) is a Belgian 7.62 mm calibre, 7.62 mm general-purpose machine gun, designed in the early 1950s at Fabrique Nationale de Herstal, Fabrique Nationale (FN) by Ernest Vervier. It has been used by more than 80 countries and it h ...
and Rheinmetall MG3 GPMGs. The first confrontations between the
AK-47 The AK-47, officially known as the Avtomat Kalashnikova (; also known as the Kalashnikov or just AK), is an assault rifle that is chambered for the 7.62×39mm cartridge. Developed in the Soviet Union by Russian small-arms designer Mikhail Kala ...
and the M14 came in the early part of the
Vietnam War The Vietnam War (1 November 1955 – 30 April 1975) was an armed conflict in Vietnam, Laos, and Cambodia fought between North Vietnam (Democratic Republic of Vietnam) and South Vietnam (Republic of Vietnam) and their allies. North Vietnam w ...
. Battlefield reports indicated that the M14 was uncontrollable in full-auto and that soldiers could not carry enough ammo to maintain fire superiority over the AK-47. While the M2 Carbine offered a high rate of fire, it was under-powered and ultimately outclassed by the AK-47. A replacement was needed: a medium between the traditional preference for high-powered rifles, such as the M14, and the lightweight firepower of the M2 Carbine.


Scaling down the ArmaLite AR-10

As a result, the Army was forced to reconsider a 1957 request by General Willard G. Wyman, commander of the U.S. Continental Army Command (CONARC), to develop a .223 caliber (5.56 mm) select-fire rifle weighing 6 lb (2.7 kg) when loaded with a 20-round magazine. The 5.56mm round had to penetrate a standard U.S. M1 helmet at and retain a velocity in excess of the speed of sound, while matching or exceeding the wounding ability of the .30 Carbine cartridge.Hutton, Robert (ed.), ''The .223'', Guns & Ammo Annual Edition, 1971. This request ultimately resulted in the development of a scaled-down version of the ArmaLite AR-10, called the ArmaLite AR-15 rifle. In 1958, ArmaLite submitted ten AR-15s and one hundred 25-round magazines for CONARC testing. The tests found that a five to seven man team armed with AR-15s had the same firepower as an 11-man team armed with M14sRifle Squad Armed with a Light Weight High Velocity Rifle
U.S. Army Combat Experimentation Center. Fort Ord. California. June 24, 1959.
and soldiers armed with AR-15s could also carry three times more ammunition than those armed with M14s (649 rounds vs. 220 rounds). The AR-15 was found to be three times more reliable than the M14 rifle. However, General Maxwell Taylor, then Army Chief of Staff, "vetoed" the AR-15 in favor of the M14. In 1959, ArmaLite—now frustrated with the lack of results and suffering ongoing financial difficulties—sold its rights to the AR-10 and AR-15 to Colt. File:ArmaLite AR-15 Left Side SPAR8367 DEC. 20. 2004.png, Early ArmaLite AR-15 without flash hider or magazine File:ArmaLite AR-15 SPAR8367 DEC. 20. 2004.png, Early ArmaLite AR-15 without magazine or flash hider File:ArmaLite AR-15 Left Side SPAR3240 DEC. 17. 2004.png, ArmaLite AR-15 with 25-round magazine and flash hider


Colt era

After acquiring the AR-15, Colt promptly redesigned the rifle to facilitate mass production. Based on the final ArmaLite design, most notably, the charging handle was re-located from under the carrying handle, like the earlier AR-10 to the rear of the receiver, like the later M16 rifle. Colt then renamed and rebranded the rifle "Colt ArmaLite AR-15 Model 01". After a Far East tour, Colt made its first sale of Colt ArmaLite AR-15 rifles to Malaya on September 30, 1959. Colt manufactured their first batch of 300 Colt ArmaLite AR-15 rifles in December 1959. Colt would go on to market the Colt ArmaLite AR-15 rifle to military services around the world. In July 1960, General Curtis LeMay, then Vice Chief of Staff of the United States Air Force, was impressed by a demonstration of the AR-15 and ordered 8500 rifles. In the meantime, the Army would continue testing the AR-15, finding that the intermediate cartridge .223 (5.56 mm) rifle is much easier to shoot than the standard 7.62×51mm NATO M14 rifle. In 1961 marksmanship testing, the U.S. Army found that 43% of AR-15 shooters achieved Expert, while only 22% of M14 rifle shooters did so. Also, a lower
recoil Recoil (often called knockback, kickback or simply kick) is the rearward thrust generated when a gun is being discharged. In technical terms, the recoil is a result of conservation of momentum, for according to Newton's third law the force requ ...
impulse, allows for more controllable automatic weapons fire. In the summer of 1961, General LeMay was promoted to Chief of Staff of the United States Air Force and requested an additional 80,000 AR-15s. However, General
Maxwell D. Taylor Maxwell Davenport Taylor (26 August 1901 – 19 April 1987) was a senior United States Army Officer (armed forces), officer and diplomat during the Cold War. He served with distinction in World War II, most notably as commander of the 101st Air ...
, now
Chairman of the Joint Chiefs of Staff The chairman of the Joint Chiefs of Staff (CJCS) is the presiding officer of the Joint Chiefs of Staff (JCS). The chairman is the highest-ranking and most senior military officer in the United States Armed Forces Chairman: appointment; gra ...
, (who repeatedly clashed with LeMay) advised President John F. Kennedy that having two different calibers within the military system at the same time would be problematic and the request was rejected. In October 1961, William Godel, a senior man at the Advanced Research Projects Agency, sent 10 AR-15s to South Vietnam. The reception was enthusiastic, and in 1962, another 1,000 AR-15s were sent.
United States Army Special Forces The United States Army Special Forces (SF), colloquially known as the "Green Berets" due to their distinctive service Berets of the United States Army, headgear, is a branch of the United States Army United States Army Special Operations Comm ...
personnel filed battlefield reports lavishly praising the AR-15 and the stopping-power of the 5.56 mm cartridge and pressed for its adoption. By intentionally choosing a slow twist rate the 55 grain bullet used in the 5.56 Ball M193 cartridge was only just stable in flight. The damage caused by the 5.56 mm bullet was originally believed to be caused by instantaneous "tumbling" on impact and render a wide, incapacitating wound due to the slow 1 in rifling twist rate. However, any pointed lead core bullet will "tumble" after penetration in flesh, because the center of gravity is towards the rear of the bullet. The large wounds observed by soldiers in Vietnam were actually caused by bullet fragmentation, which was created by a combination of the bullet's velocity and construction. These wounds were so devastating that the photographs remained classified into the 1980s. However, despite overwhelming evidence that the AR-15 could bring more firepower to bear than the M14, the Army opposed the adoption of the new rifle. U.S. Secretary of Defense
Robert McNamara Robert Strange McNamara (; June 9, 1916 – July 6, 2009) was an American businessman and government official who served as the eighth United States secretary of defense from 1961 to 1968 under presidents John F. Kennedy and Lyndon B. Johnson ...
now had two conflicting views: the USAF's (General LeMay's) repeated requests for additional AR-15s and the ARPA report favoring the AR-15, versus the Army's position favoring the M14. Even President Kennedy expressed concern, so McNamara ordered Secretary of the Army
Cyrus Vance Cyrus Roberts Vance (March 27, 1917January 12, 2002) was an American lawyer and diplomat who served as the 57th United States Secretary of State under President Jimmy Carter from 1977 to 1980. Prior to serving in that position, he was the United ...
to test the M14, the AR-15 and the AK-47. The Army reported that only the M14 was suitable for service, but Vance wondered about the impartiality of those conducting the tests. He ordered the Army Inspector General to investigate the testing methods used; the Inspector General confirmed that the testers were biased towards the M14. In January 1963, Secretary McNamara received reports that M14 production was insufficient to meet the needs of the armed forces and ordered a halt to M14 production. At the time, the AR-15 was the only rifle that could fulfill a requirement of a "universal" infantry weapon for issue to all services. McNamara ordered its adoption, despite receiving reports of several deficiencies, most notably the lack of a chrome-plated chamber. After minor modifications, the new redesigned rifle was renamed the "Rifle, Caliber 5.56 mm, M16". Meanwhile, the Army relented and recommended the adoption of the M16 for jungle warfare operations. However, the Army insisted on the inclusion of a forward assist to help push the bolt into battery in the event that a cartridge failed to seat into the chamber. The Air Force, Colt and Eugene Stoner believed that the addition of a forward assist was an unjustified expense. As a result, the design was split into two variants: the Air Force's M16 without the forward assist, and the "XM16E1 (AKA: M16A1)" with the forward assist for the other service branches. In November 1963, McNamara approved the U.S. Army's order of 85,000 XM16E1s; and to appease LeMay, the Air Force was granted an order for another 19,000 M16s. In March 1964, the M16 rifle went into production and the Army accepted delivery of the first batch of 2129 rifles later that year, and an additional 57,240 rifles the following year. The Colt ArmaLite AR-15 was discontinued with the adoption of the M16 rifle. Most AR-15 rifles in U.S. service have long ago been upgraded to M16 configuration. The Colt ArmaLite AR-15 was also used by the United States Secret Service and other U.S. federal, state and local law enforcement agencies. Shortly after the United States military adopted the M16 rifle, Colt introduced its line semi-automatic-only Colt AR-15 rifles, which it markets to civilians and law enforcement. Colt continues to use the AR-15 name for these rifles. File:Colt ArmaLite AR-15 Model 01 SPAR1372 DEC. 22. 2004.jpg, Colt ArmaLite AR-15 Model 01 with 20-round magazine File:Colt ArmaLite AR-15 Model 02 SPAR1373 DEC. 22. 2004.jpg, Colt ArmaLite AR-15 Model 02 without magazine and new 1 in rifling twist rate File:Armamento - Museo de Armas de la Nación 05.JPG, An early M16 rifle without forward assist File:Hickey-ar-15 jfk.jpg, Secret Service agent George W. Hickey with an ArmaLite AR-15 Model 01 moments after President Kennedy was shot in Dallas on November 22, 1963


Colt ArmaLite AR-15 (Model 601 and 602)

Colt's first two models produced after the acquisition of the rifle from ArmaLite were the 601 and 602, and these rifles were in many ways clones of the original ArmaLite rifle (in fact, these rifles were often found stamped ''Colt ArmaLite AR-15, Property of the U.S. Government caliber .223'', with no reference to them being M16s). The 601 and 602 are virtually identical to the later M16 rifle without the forward-assist. Like the later M16 rifle their charging handle was re-located from under the carrying handle like AR-10 to the rear of the receiver. They were equipped with triangular fore-stocks and occasionally green or brown furniture. Their front sight had a more triangular shape. They had flat lower receivers without raised surfaces around the magazine well. Their bolt hold open device lacked a raised lower engagement surface and had a slanted and serrated surface that had to be engaged with a bare thumb, index finger, or thumb nail because of the lack of this surface. Their fire-selector was also changed from upward = safe, backward = semi-auto and forward = full-auto, to the now familiar forward = safe, upward = semi-auto, and backward = full-auto of the M16 rifle. The only major difference between the 601 and 602 is the switch from the original four grooves, right-hand 1:14-inch (1:355.6 mm or 64 calibers)
rifling Rifling is the term for helical grooves machined into the internal surface of a firearms's barrel for imparting a spin to a projectile to improve its aerodynamic stability and accuracy. It is also the term (as a verb) for creating such groov ...
twist rate to the more common four grooves, right-hand 1:12-inch (1:304.8 mm or 54.8 calibers) twist. This was done as the original 1:14-inch twist rate to just stabilize the 55 grain bullet used in the 5.56 Ball M193 cartridge under unfavorable conditions could induce too much yaw and due to the resulting excessive in flight bullet destabilization become inaccurate. The one turn in 12 inches increased accuracy and was optimized to adequately stabilize the M193 ball and longer M196 tracer bullets. File:Colt ArmaLite AR-15 Model 01. Left Side SPAR1372 DEC. 22. 2004.jpg, Colt ArmaLite AR-15 Model 01 with 20-round magazine, made from 1959 to 1964 File:Colt Armalite AR-15 Model 02 Left Side SPAR1373 DEC. 22. 2004.jpg, Colt ArmaLite AR-15 Model 02 without magazine and new 1 in rifling twist rate, made in 1964


Design details

The ArmaLite AR-15 internal piston action was derived from the original ArmaLite AR-10 action and was later used in the
M16 rifle The M16 (officially Rifle, Caliber 5.56 mm, M16) is a family of assault rifles adapted from the ArmaLite AR-15 rifle for the United States Armed Forces, United States military. The original M16 was a 5.56×45mm NATO, 5.56×45mm automatic ...
action. This internal piston action system designed by Eugene Stoner is commonly called a direct impingement system, but it does not utilize a conventional direct impingement system. In , the designer states: The gas system, bolt carrier, and bolt-locking design were patented at for the time and is ammunition specific, since it does not have an adjustable gas port or valve to adjust the weapon to various propellant and projectile or barrel length specific pressure behavior. The AR-15 is a modular weapon system. It is easy to assemble, modify and repair using a few simple hand tools, and a flat surface to work on. The AR-15's upper receiver incorporates the fore stock, the charging handle, the gas operating system, the barrel, the bolt and bolt carrier assembly. The lower receiver incorporates the magazine well, the pistol grip and the buttstock. The lower receiver also contains the trigger, disconnector, hammer and fire selector (collectively known as the fire control group). The AR-15's "duckbill" flash suppressor had three tines or prongs and was designed to preserve the shooter's night vision by disrupting the flash. Early AR-15's had a 25-round magazine. Later model AR-15s used a 20-round waffle-patterned magazine that was meant to be a lightweight, disposable item. As such, it is made of pressed/stamped aluminum and was not designed to be durable. The AR-15's most distinctive ergonomic feature is the carrying handle and rear sight assembly on top of the receiver. This is a by-product of the design, where the carry handle serves to protect the charging handle. The AR-15 rifle has a 500 mm (19.75 inches) sight radius. The AR-15 uses an L-type flip, aperture rear sight and it is adjustable with two settings, 0 to 300 meters and 300 to 400 meters. The front sight is a post adjustable for elevation. The rear sight can be adjusted for windage. The sights can be adjusted with a bullet tip or pointed tool. The AR-15's straight-line recoil design, where the recoil spring is located in the stock directly behind the action, and serves the dual function of operating spring and recoil buffer. The stock being in line with the bore also reduces muzzle rise, especially during automatic fire. Because recoil does not significantly shift the point of aim, faster follow-up shots are possible and user fatigue is reduced.


See also

* List of ArmaLite rifles * List of AR platform cartridges


Notes


References

* *


Further reading

* --> * 1983
National Book Award The National Book Awards (NBA) are a set of annual U.S. literary awards. At the final National Book Awards Ceremony every November, the National Book Foundation presents the National Book Awards and two lifetime achievement awards to authors. ...
winner. * One of three excerpts from ''National Defense'' published in ''
The Atlantic ''The Atlantic'' is an American magazine and multi-platform publisher based in Washington, D.C. It features articles on politics, foreign affairs, business and the economy, culture and the arts, technology, and science. It was founded in 185 ...
''; includes the origin of the Armalite AR-15. * McWhirter, Cameron and Zusha Elinson. ''American Gun: The True Story of the AR-15''. New York: Farrar, Straus and Giroux, 2023.


External links


Ciener Belt-Fed AR
{{Commons category, ArmaLite AR-15 AR-15 style rifles 5.56 mm assault rifles Assault rifles of the United States ArmaLite AR-10 derivatives Colt rifles Gas-operated firearms