Question: What is a family of United States automatic rifles (machine rifles) and light machine guns used by the United States, that were produced by a company at the former Stevens-Duryea factory that was originally constructed for car manufacturing in 1912?

Context articles: 6×45mm SAW
New England Small Arms
Squad automatic weapon
M1918 Browning Automatic Rifle
Machine gun
Light machine gun
Small arms
New England Westinghouse Company
M249 light machine gun
Chauchat

The 6×45mm SAW describes an experimental series of rimless bottlenecked intermediate cartridges developed in the 1970s for the U.S. Army.
 The cartridges were produced in a variety of sizes and from a variety of materials.
 The intent was to develop a cartridge that would replace all 5.56×45mm NATO weapons as well as most 7.62×51mm NATO rifles and machine guns in the U.S. military.
 Eventually, the 5.56mm was retained and only the machine gun portion of the SAW (Squad Automatic Weapon) competition was successful.
 That program led to the M249 light machine gun.
New England Small Arms Corporation was a consortium of small manufacturers who coordinated their facilities for production of M1918 Browning Automatic Rifles during World War II.
 The company was an unusual variation of United States conversion of small manufacturing plants from civilian goods to military armaments production.
 Other manufacturers of this size typically produced firearm components on a subcontract basis for larger prime contractors responsible for assembly and delivery.
 Boston Wire Stitcher Company of East Greenwich, Rhode Island, A.G.Spalding & Brothers of Chicopee, Massachusetts, Blake Manufacturing Company of Clinton, Massachusetts, International Silver Company of Meriden, Connecticut, National Blank Book Company of Holyoke, Massachusetts, and Elliot Addressing Machine Company of Cambridge, Massachusetts distributed tooling used for M1918 rifle production during World War I by Winchester Repeating Arms and Marlin-Rockwell.
 Each company manufactured different rifle components and forwarded them for final assembly to a jointly operated facility converted to wartime arms production in Crompton, Rhode Island.
 The corporation was created for M1918 rifle production and dissolved as members of the consortium returned to pre-war production when wartime procurement contracts were canceled.
 The firm produced 188,380 M1918 rifles, or 90% of the total wartime production of 208,380.
A squad automatic weapon (SAW, also known as section automatic weapon or light support weapon) is a weapon used to give infantry squads or sections a portable source of fully automatic firepower.
 Weapons used in this role are often selective fire rifles, usually fitted with a bipod and heavier barrel to perform as light machine guns. Squad automatic weapons usually fire the same cartridge as the assault rifles or battle rifles carried by other members of the unit.
 This reduces logistical requirements by making it only necessary to supply one type of ammunition to a unit.
 Squad automatic weapons are light enough to be operated by one person, as opposed to heavy machine guns such as the M2 Browning, which fire more powerful cartridges but require a crew to operate at full effectiveness.
The Browning Automatic Rifle (BAR) is a family of United States automatic rifles (machine rifles) and light machine guns used by the United States and numerous other countries during the 20th century.
A machine gun is a fully automatic mounted or portable firearm designed to fire bullets in quick succession from an ammunition belt or magazine, typically at a rate of 300 to 1800 rounds per minute.
 Not all fully automatic firearms are machine guns.
 Submachine guns, rifles, assault rifles, shotguns, pistols or cannons may be capable of fully automatic fire, but are not designed for sustained fire.
 As a class of military rapid-fire guns, machine guns are fully automatic weapons designed to be used as support weapons and generally used when attached to a mount or fired from the ground on a bipod or tripod.
 Many (but not all) machine guns also use belt feeding and open bolt operation, features not normally found on rifles.
A light machine gun (LMG) is a machine gun designed to be employed by an individual soldier, with or without an assistant, as an infantry support weapon.
 Light machine guns are often used as squad automatic weapons.
In international arms control, small arms include revolvers and pistols, rifles and carbines, assault rifles, submachine guns, and light machine guns. Together with light weapons (heavy machine guns; hand-held grenade launchers; portable anti-aircraft and anti-tank guns; recoilless rifles; portable launchers of anti-aircraft and anti-tank missile systems; and mortars of calibres of less than 100 mm), they comprise the Small Arms and Light Weapons (SALW) protocol.
The New England Westinghouse Company is a former division of Westinghouse Electric.
 It was founded in 1915 in East Springfield, Massachusetts.
 Its primary purpose was to fulfill a contract to produce 1.8 million Mosin–Nagant rifles for Czar Nicholas II of Russia during World War I.
 In order to produce the rifles, they purchased the J Stevens Arms & Tool Company in Chicopee Falls, MA on 1 July 1916 and acquired all its holdings which included firearms and tool manufacturing facilities, and the Stevens-Duryea automobile factory.
 They sold the tool manufacturing portion of Stevens and shut down production of Stevens-Duryea automobiles and civilian firearms.
 The remaining Stevens firearms facility was renamed the J Stevens Arms Company and its machinery was retooled to meet the Mosin–Nagant contract.
 After some 770,000 rifles had been produced, the Czar was deposed, the Russian government defaulted on the contract, and New England Westinghouse did not receive payment.
 The company entered hard times and started producing M1918 Browning Automatic Rifles at the former Stevens-Duryea factory that was originally constructed for car manufacturing in 1912.
 In 1920 they sold the J Stevens Arms Company to Savage Arms but kept the automobile factory for use producing commercial products for Westinghouse Electric.
 In 1921, the Stevens-Duryea factory was the location of the first broadcasts of WBZ (AM), the first commercial radio station in the United States.
The M249 light machine gun (LMG), formerly designated the M249 Squad Automatic Weapon (SAW) and formally written as Light Machine Gun, 5.56 mm, M249, is the American adaptation of the Belgian FN Minimi, a light machine gun manufactured by the Belgian company FN Herstal (FN).
 The M249 is manufactured in the United States by the local subsidiary FN Manufacturing LLC in South Carolina and is widely used in the U.S. Armed Forces.
 The weapon was introduced in 1984 after being judged the most effective of a number of candidate weapons to address the lack of automatic firepower in small units.
 The M249 provides infantry squads with the high rate of fire of a machine gun combined with accuracy and portability approaching that of a rifle.
The Chauchat, named after Colonel Louis Chauchat, the main contributor to its design, was the standard machine rifle or light machine gun of the French Army during World War I (1914–18).
 Its official designation was "Fusil Mitrailleur Modele 1915 CSRG" (in English: ""Machine Rifle Model 1915 CSRG"").
 Beginning in June 1916, it was placed into regular service with French infantry, where the troops called it the FM Chauchat.
 The Chauchat machine rifle in 8mm Lebel was also extensively used in 1917–18 by the American Expeditionary Forces (A.E.F), where it was officially designated as the "Automatic Rifle, Model 1915 (Chauchat)".
 A total of 262,000 Chauchat machine rifles were manufactured between December 1915 and November 1918, including 244,000 chambered for the 8mm Lebel service cartridge, making it the most widely manufactured automatic weapon of World War I.
 The armies of eight other nations – Belgium, Finland, Greece, Italy, Poland, Romania, Russia, and Serbia – also used the Chauchat machine rifle in fairly large numbers during and after World War I.