The Browning automatic rifle (BAR) is a family of American automatic rifle used by the United States and numerous other countries during the 20th century. The primary variant of the BAR series was the M1918, chambered for the .30-06 Springfield rifle cartridge and designed by John Browning in 1917 for the American Expeditionary Forces in Europe as a replacement for the French-made Chauchat and M1909 Benét–Mercié machine guns that U.S. forces had previously been issued.

The BAR was designed to be carried by infantrymen during an assault Article by Maxim Popenker, 2014. advance while supported by the sling over the shoulder, or to be fired from the hip. This is a concept called "walking fire"—thought to be necessary for the individual soldier during trench warfare. The BAR never entirely lived up to the original hopes of the War Department as either a rifle or a machine gun.

The U.S. Army, in practice, used the BAR as a light machine gun, often fired from a bipod (introduced on models after 1938).Bishop, Chris: The Encyclopedia of Weapons of World War II, p. 239. Sterling Publishing, 2002. A variant of the original M1918 BAR, the Colt Monitor machine rifle, remains the lightest production automatic firearm chambered for the .30-06 Springfield cartridge, though the limited capacity of its standard 20-round magazine tended to hamper its utility in that role.

Although the weapon did see action in late 1918 during World War I, the BAR did not become standard issue in the U.S. Army until 1938, when it was issued to squads as a portable light machine gun. The BAR saw extensive service in both World War II and the Korean War and saw limited service in the Vietnam War. The U.S. Army began phasing out the BAR in the 1950s, when it was intended to be replaced by a squad automatic weapon (SAW) variant of the M14, and as a result the U.S. Army was without a portable light machine gun until the introduction of the M60 machine gun in 1957.

History

The U.S. entered World War I with an inadequate, small, and obsolete assortment of domestic and foreign machine gun designs, due primarily to bureaucratic indecision and the lack of an established military doctrine for their employment. When the United States declaration of war on Germany was announced on 6 April 1917, the high command was made aware that to fight this trench war, dominated by machine-guns, they had on hand a mere 670 M1909 Benét–Merciés, 282 M1904 Maxims and 158 Colt-Browning M1895s. After much debate, it was finally agreed that a rapid rearmament with domestic weapons would be required, but until that time, U.S. troops would be issued whatever the French and British had to offer. The arms donated by the French were often second-rate or surplus and chambered in 8mm Lebel, further complicating logistics as machine gunners and infantrymen were issued different types of ammunition.

Development Browning began to design the weapon later known as the BAR in 1910. He demonstrated the prototypes to the U.S. military, which did not see an immediate use for the weapon until 1917.

In 1917, prior to America's entry to the war, John Browning personally brought to Washington, D.C. two types of automatic weapons for the purposes of demonstration: a water-cooled machine gun (later adopted as the M1917 Browning machine gun) and a shoulder-fired automatic rifle known then as the Browning Machine Rifle or BMR, both chambered for the standard U.S. .30-06 Springfield (7.62×63mm) cartridge. Colt and the Ordnance Department arranged for a public demonstration of both weapons at a location in southern Washington, D.C. known as Congress Heights. There, on 27 February 1917, in front of a crowd of 300 people (including high-ranking military officials, congressmen, senators, foreign dignitaries and the press), the Army staged a live-fire demonstration which so impressed the gathered crowd, that Browning was immediately awarded a contract for the weapon and it was hastily adopted into service (the water-cooled machine gun underwent further testing).

Additional tests were conducted for U.S. Army Ordnance officials at Springfield Armory in May 1917, and both weapons were unanimously recommended for immediate adoption. In order to avoid confusion with the belt-fed M1917 machine gun, the BAR came to be known as the M1918 or Rifle, Caliber .30, Automatic, Browning, M1918 according to official nomenclature. On 16 July 1917, 12,000 BARs were ordered from Colt's Patent Firearms Manufacturing Company, which had secured an exclusive concession to manufacture the BAR under Browning's patents (Browning's was owned by Colt). However Colt was already producing at peak capacity (contracted to manufacture the Vickers machine gun for the British Army) and requested a delay in production while they expanded their manufacturing output with a new facility in Meriden, Connecticut. Due to the urgent need for the weapon, the request was denied and the Winchester Repeating Arms Company (WRAC) was designated as the prime contractor. Winchester gave valuable assistance in refining the BAR's final design, correcting the drawings in preparation for mass production. Among the changes made, the ejection pattern was modified (spent cases were directed to the right side of the weapon instead of straight up).

Initial M1918 production

Since work on the weapon did not begin until February 1918, so hurried was the schedule at Winchester to bring the BAR into full production that the first production batch of 1,800 rifles was delivered out of spec; it was discovered that many components did not interchange between rifles, and production was temporarily halted until manufacturing procedures were upgraded to bring the weapon up to specifications. The initial contract with Winchester called for 25,000 BARs. They were in full production by June 1918, delivering 4,000 units, and from July were turning out 9,000 units per month.

Colt and Marlin-Rockwell Corp. also began production shortly after Winchester got into full production. Marlin-Rockwell, burdened by a contract to make rifles for the Belgian government, acquired the Mayo Radiator Co.'s factory and used it exclusively to carry out production of the BAR. The first unit from this source was delivered on 11 June 1918 and the company's peak output reached 200 automatic rifles per day. Colt had produced only 9,000 BARs by the time of the armistice due to the heavy demands of previous orders. These three companies produced a combined daily output of 706 rifles and a total of approximately 52,000 BARs were delivered by all sources by the end of the war. Between 1918 and 1919, 102,174 BARs had been manufactured jointly by Colt, Winchester, and Marlin-Rockwell.

By July 1918, the BAR had begun to arrive in France, and the first unit to receive them was the U.S. Army's 79th Infantry Division, which took them into action for the first time on 13 September 1918. The weapon was personally demonstrated against the enemy by 2nd Lt. Val Allen Browning, the inventor's son. Despite being introduced very late in the war, the BAR made an impact disproportionate to its numbers; it was used extensively during the Meuse–Argonne offensive and made a significant impression on the Allies (France alone requested 15,000 automatic rifles to replace their Chauchat machine rifles).

The U.S. Marines briefly took possession of the BAR. Troops from the First Battalion of the Sixth Marines had talked the "doggies" of the U.S. Army's 36th Division into trading their BARs for their Chauchats. However, complaints from officers of the 36th resulted in the issuance of a command from Marine Lt. Col. Harry Lee on 9 October 1918: All Browning guns and equipment in Marine possession were to be turned in.George Clark; The Fourth Marine Brigade in World War I: Battalion Histories Based on Official Documents; Chapter - First Battalion, Sixth Marines; page 180

Design details and accessories The M1918 is a selective-fire, air-cooled automatic rifle using a gas-operated, long-stroke piston rod actuated by propellant gases bled through a vent in the barrel. The bolt is locked by a rising bolt lock. The weapon fires from an open bolt. The spring-powered cartridge case extractor is contained in the bolt and a fixed ejector is installed in the trigger group. The BAR is striker-fired (the bolt carrier serves as the striker) and uses a trigger mechanism with a fire selector lever that enables operating in either semi-automatic or fully automatic firing modes. The selector lever is located on the left side of the receiver and is simultaneously the manual safety (selector lever in the "S" position – weapon is safe, "A" – automatic fire, "F" – semi-automatic fire). The "safe" setting blocks the trigger from operating. The A2 variant changed the function of the fire selector, leaving "A" for automatic fire at the normal (full) cyclic rate, and changing "F" to automatic fire at a reduced (and more controllable) cyclic rate.

The weapon's barrel is screwed into the receiver and is not quickly detachable. The M1918 feeds using double-column 20-round box magazines, although 40-round magazines were also used in an anti-aircraft role; these were withdrawn from use in 1927. The M1918 has a cylindrical flash suppressor fitted to the muzzle end. The original BAR was equipped with a fixed wooden buttstock and closed-type adjustable iron sights taken from the Enfield 1917, consisting of a forward post and a rear leaf sight with range graduations. As a heavy automatic rifle designed for support fire, the M1918 was not fitted with a bayonet mount and no bayonet was ever issued, though one experimental bayonet fitting was made by Winchester.

Subsequent models

During its lengthy service life, the BAR underwent continuous development, receiving many improvements and modifications. The first major attempt at improving the M1918 resulted in the M1922 machine rifle, adopted by the United States Cavalry in 1922 as a troop-level light machine gun. The weapon used a new heavy profile ribbed barrel, an adjustable spiked bipod (mounted to a swiveling collar on the barrel) with a rear, stock-mounted monopod, a side-mounted sling swivel and a new rear buttplate, fixed to the stock retaining sleeve. The hand guard was changed, and in 1926 the BAR's sights were redesigned to accommodate the heavy-bullet 172-grain M1 .30-06 ball ammunition then coming into service for machinegun use.

In 1932, a greatly shortened version was developed, the "BAR, cal. .30, M1918 (modified)" better known as the "jungle BAR" designed for bush and jungle warfare was developed by USMC Maj. H.L. Smith and was the subject of an evaluative report by Capt. Merritt A. Edson, ordnance officer at the Quartermaster's Depot in Philadelphia, Pennsylvania. The barrel was shortened at the muzzle and the gas port and gas cylinder tube were relocated. The modified BAR weighed and was only long overall. Though it proved superior to the M1918 in accuracy when fired prone in automatic mode and equal in accuracy to the standard M1918 at ranges of from a rest, it was less accurate when fired from the shoulder, and had a loud report combined with a fierce muzzle blast.: According to one evaluation, the "bush" model had a report as loud as the T9 37mm automatic AA cannon. Attaching a Cutts compensator materially reduced the muzzle blast, but this was more than offset by the increase in smoke and dust at the muzzle when fired, obscuring the operator's vision. Nor did it improve control of the weapon when fired in bursts of automatic fire. Though the report recommended building six of these short-barreled jungle BARs for further evaluation, no further work was done on the project.