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American Machine Guns

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Here are some of the more well known American Machine Guns. Some of these are very well known.

Browning BAR(Browning Automatic Rifle) M1918
Caliber: 7.62x63mm (.30-06 M2)
Weight: 8.8 kg empty
Length: 1214 mm
Length of barrel: 610 mm
Feeding: detachable box magazine, 20 rounds
Rate of fire: 450 or 650 rounds/min, selectable
 
The Browning Automatic Rifle was designed by the famous American arms designer John Moses Browning late in the First World War, on the request from US Expeditionary corps in Europe. Initially it was just like that - the Automatic Rifle, a selective fire weapon, intended for use by infantry men to fire from the shoulder or from the hip when advancing onto the enemy positions, and to provide mobile firepower to every squad, since the standard machine guns were heavy and much less maneuverable. But the BAR M1918 was way too heavy for a shoulder fired weapon, being more that 2 times heavier than a bolt-action Springfield M1903 rifle and exactly 2 times heavier than a latter M1 Garand semiautomatic rifle. The downside was that it was too light to be fired in fully automatic mode, since the recoil would be too high to aim accuratly.The BAR M1918 is a gas operated, magazine fed, air cooled weapon. It used the gas piston, located under the barrel, and the bolt with tilting locking lug, that was raised to lock into the roof of the receiver. This lug was linked to the operating rod via the swinging link, much like in the earlier Berthier system. The BAR always fired from the open bolt to avoid cook-offs. The return spring was located around the gas piston under the barrel, so it was prone to overheating and lost its temper during the prolonged fire sessions, resulting in jams and stoppages. This issue was somewhat cured in M1918A1 with introduction of the heat shield between the barrel and the spring, located inside the forend. The receiver was a machined piece of steel, and the un was fed from the detachable 20 rounds box magazines. Barrel was fitted with flash hiders of different types, and, since the M1818A1, the wooden tock was also fitted with the hinged buttplate. The latter production s of M1918A2 were also fitted with carrying handle. The tocks and forends were mostly made from wood, but on late production M1918A2's sometimes were also made from plastics.
 
Browning M2HB .50 cal

Caliber: .50BMG (12,7x99mm)
Weigth: 38 kg MG, 58 kg complete with M3 tripod
Length: 1650 mm
Length of barrel: 1140 mm
Feeding: belt 100 rounds
Rate of fire: 450-600 rounds/min
V0, m/s: 930 m/s

Caliber: .50BMG (12,7x99mm)
Weigth: 38 kg MG, 58 kg complete with M3 tripod
Length: 1650 mm
Length of barrel: 1140 mm
Feeding: belt 100 rounds
Rate of fire: 450-600 rounds/min
V0, m/s: 930 m/s

Famous Browning M2 was initially designed in USA as an aircraft gun, but in 1921 modernized for ground use and adopted as 1921 machinegun. In 1932 1921 MG was modernized again and adopted under designation of M2. Later, after introduction of heavier barrel (for increased practical fire rate and number of rounds between barrel change) the gun was named M2HB. In M2HB, every barrel replacement must be followed with time-consuming procedure of headspace and timing ajustment, and only relatively recently QCB (Quick Change Barrel) kits were introduced. This kit may be used in any M2HB gun, allowing quick barrel change under the battle conditions. This version may be called M2HB-QCB or M2HQCB.
For todays standarts, M2HB is quite heavy gun, and recently an US based company Ramo Defence introduced M2 Lightweight machinegun. M2 Lightweight is a new development weapon designed as a response to both ground and air forces requirement for a reduced weight .50 Caliber weapon. Utilizing the M2 Browning principles and almost 75% parts of the original M2, the weapon has been upgraded to include an adjustable buffer to vary firing rate, a patented quick change lightweight "Stellite" lined, chrome bore barrel with flash suppressor, "MAX SAFE" charging system, and trigger safety switch. M2 Lightweight weights only 27 kg (11 kg less than original M2HB), and has ajustable rate of fireof 550-750 rounds/min. M2 is a belt-fed, air-cooled, recoil operated full-auto only weapon. M2 operates wia short moving barrel. It could be used from M3 tripod (can not be used agains air targets), on M63 Anti-aircraft mount, it can be pintle, turret or coaxila mounted on combat vehicles or aircrafts. Famous Browning M2 was initially designed in USA as an aircraft gun, but in 1921 modernized for ground use and adopted as 1921 machinegun. In 1932 1921 MG was modernized again and adopted under designation of M2. Later, after introduction of heavier barrel (for increased practical fire rate and number of rounds between barrel change) the gun was named M2HB. In M2HB, every barrel replacement must be followed with time-consuming procedure of headspace and timing ajustment, and only relatively recently QCB (Quick Change Barrel) kits were introduced. This kit may be used in any M2HB gun, allowing quick barrel change under the battle conditions. This version may be called M2HB-QCB or M2HQCB.
For todays standarts, M2HB is quite heavy gun, and recently an US based company Ramo Defence introduced M2 Lightweight machinegun. M2 Lightweight is a new development weapon designed as a response to both ground and air forces requirement for a reduced weight .50 Caliber weapon. Utilizing the M2 Browning principles and almost 75% parts of the original M2, the weapon has been upgraded to include an adjustable buffer to vary firing rate, a patented quick change lightweight "Stellite" lined, chrome bore barrel with flash suppressor, "MAX SAFE" charging system, and trigger safety switch. M2 Lightweight weights only 27 kg (11 kg less than original M2HB), and has ajustable rate of fireof 550-750 rounds/min. M2 is a belt-fed, air-cooled, recoil operated full-auto only weapon. M2 operates wia short moving barrel. It could be used from M3 tripod (can not be used agains air targets), on M63 Anti-aircraft mount, it can be pintle, turret or coaxila mounted on combat vehicles or aircrafts.

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