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This article is about the .50 caliber M2 machine gun. For the .30-06 M2 machine gun, see M1919 Browning Machine Gun . The M2 Machine Gun, or ''Browning .50 Caliber Machine Gun'' is a Heavy Machine Gun designed towards the end of World War I by John Browning . It was nicknamed ''Ma Deuce'' by US troops or simply called "fifty-cal" in reference to its caliber. The design has had many specific designations; the official designation for the current infantry type is '''Browning Machine Gun, Cal. .50, M2, HB, Flexible'''. The Browning .50 machine gun has been used extensively as a vehicle weapon and for aircraft armament by the United States from the 1920s to the present day. It was heavily used during World War II , the Korean War , the Vietnam War , as well as during operations in Iraq in the 1990s and 2000s. It is the primary heavy machine gun of NATO countries, and has been used by many other countries. It is still in use today. It was very similar in design to the smaller Browning Model 1919 Machine Gun . HISTORY Using a round originally designed by superseded it (air-cooled barrels had already been used on variants for use on aircraft, but these quickly overheated in ground use). The added mass and surface area of the new barrel compensated, somewhat, for the loss of water-cooling, while reducing bulk and weight (the M2 weighed 121 lbs, with water, whereas the M2 HB weighs 84 lbs). This new variant was the designated the M2 HB (''HB'' for '''''H'''eavy '''B'''arrel''). Due to the long procedure for changing the barrel, an improved system was developed called '''QCB''' (quick change barrel). A lightweight version, weighing 24 lb (11 kg) less—a mere 60 lb (27 kg)—was also developed. DESIGN The M2 is a scaled-up version of John Browning's M1917 .30 caliber machine gun (even using the same timing gauges), and fires the .50 BMG cartridge, which today is also used in high-powered Sniper Rifle s and long range target rifles due to its excellent long range accuracy, External Ballistics performance, incredible stopping power, and lethality. The M2 is an Air-cooled , Belt-fed , machine gun that fires from a Closed Bolt , operated on the Short Recoil principle. In this action, the Bolt and Barrel are initially locked together, and recoil upon firing. After a short distance, the bolt and barrel unlock, and the bolt continues to move rearwards relative to the barrel. This action opens the bolt, and pulls the belt of ammunition through the weapon, readying it to fire again, all at a cyclic rate of 450–550 rounds per minute (600–1,200 M2/M3 in WW2 aircraft, 300 synchronized M2). This is a rate of fire not generally achieved in use, as sustained fire at that rate will "shoot out" the barrel within a few thousand rounds, necessitating replacement. The M2 machine gun's sustained rate of fire is considered to be anything less than 40 rounds per minute. The M2 has a maximum range of 7.4 kilometers (4.55 miles) when using the M2 ball ammunition, with a maximum effective range of 1.8 kilometers (1.2 miles) when fired from the M3 Tripod . In its ground-portable, crew-served role, the gun itself weighs in at a hefty 84 pounds (38 kg), and the assembled M3 tripod another 44 pounds (20 kg). In this configuration, the V-shaped "butterfly" trigger is located at the very rear of the weapon, with a "spade handle" hand-grip on either side of it and the bolt release the center. The "spade handles" are gripped and the butterfly trigger is depressed with one or both thumbs. When the bolt release is locked down by the bolt latch release lock on the buffer tube sleeve, the gun functions in fully automatic mode. Conversely, the bolt release can be unlocked into the up position resulting in single-shot firing (the gunner must press the bolt latch release to send the bolt forward). In either mode the gun is fired by pressing the butterfly triggers. Recently new rear buffer assemblies have used squeeze triggers mounted to the hand grips doing away with the butterfly triggers. Because the M2 was intentionally designed to be fit into many configurations, it can be adapted to feed from the left or right side of the weapon by exchanging the belt-holding pawls, the belt feed pawl, the front and rear cartridge stops, and reversing the bolt switch. The conversion can be completed in under a minute with no tools. When firing blanks, a large Blank-firing Adapter (BFA) must be used to keep the gas pressure high enough to allow the action to cycle. The adapter is very distinctive, attaching to the muzzle with three rods extending back to the base. The BFA can often be seen on M2s during peacetime operations. COMBAT USE .]] The M2 .50 Browning machine gun is used for various roles:
# The M2HB has a full automatic mode activated by locking down the bolt release lever between the butterfly triggers. Full automatic fire mode is achieved by rotating a snap spring on the exterior of the buffer housing to hold the bolt release down. The M2HB can be fired dependably in single-shot mode with the bolt release up and pressing it to load each round. A skilled gunner can can fire single rounds by quickly releasing the butterflies on full automatic mode. In either mode the gun is fired by pressing the butterfly trigger. # Its traversing-and-elevating (T & E) mechanism attached to the tripod made accurate aiming possible, by turning the traversing handwheel and elevating handwheel until the target was in the sights. Using the Unertl scope supplied on his Winchester Model 70 .30-06 sniper rifle and a mounting bracket of his own design, Hathcock could quickly convert the M2 into a rifle that, in single-fire mode, could accurately hit targets at up to 2500 yards--twice the range of the Winchester sniper rifle. The success of the M2 in this role led to the development of purpose-built sniper rifles, generally bolt-action, designed to fire the same .50-caliber round. A water-cooled version of the larger M2 was used as an emplaced or vehicle-mounted anti-aircraft weapon on a sturdy pedestal mount. Commonwealth use of the .50 was limited in the Second World War, despite it being standard armament on US-built/designed AFVs such as the M4 Sherman or M10 Wolverine that began to see use in British , Canadian , Australian and New Zealand units from 1942 on. Commonwealth tank crew commanders more often than not deleted the .50 altogether as being of limited use, given three factors. First, the weapon was an anti-aircraft weapon, and Allied aerial superiority rendered it unnecessary. Second, in order to employ the weapon against ground targets, the commander had to exit the turret and expose himself to enemy fire. Finally, Commanders, especially in Italy, also found that the gun caught on low-hanging trees and vines and posed a danger to the crew commander's head and face. VARIANTS AND DERIVATIVES M2 variants The basic M2 was deployed in US service in a number of subvariants, all with separate complete designations as per the US Army system. The basic designation as mentioned in the introduction is Browning Machine Gun, Cal. .50, M2, with others as described below. The development of the M1921 water-cooled machine gun which led to the M2, meant that the initial M2s were in fact water-cooled. These weapons were designated Browning Machine Gun, Cal. .50, M2, Water-Cooled, Flexible. There was no fixed water-cooled version. Improved air-cooled heavy barrel versions came in three subtypes. The basic infantry model, Browning Machine Gun, Cal. .50, M2, HB, Flexible, a fixed developed for use on the M6 Heavy Tank designated '''Browning Machine Gun, Cal. .50, M2, HB, Fixed''', and a "turret type" whereby "Flexible" M2s were modified slightly for use in tank turrets. The subvariant designation '''Browning Machine Gun, Cal. .50, M2, HB, Turret''' was only used for manufacturing, supply, and administration identification and separation from flexible M2s. Specific aircraft versions were also developed, and these subvariants are discussed in the following paragraph along with the AN/M2. AN/M2, M3, XM296/M296, and GAU-10/A The M2 machine gun was heavily used as a remote fired fixed weapon, primarily in aircraft, but also in other applications. For this a variant of the M2 was developed (sometimes seen under the designation '''AN/M2''', but it is important to note that there were .30 and .50 caliber weapons with this designation), with the ability to fire from a solenoid trigger. For aircraft mounting some were also fitted with substantially lighter barrels, permitted by the cooling effect of air in the slip-stream. The official designation for this weapon was '''Browning Machine Gun, Aircraft, Cal. .50, M2''' followed by either "Fixed" or Flexible" depending on whether the weapon was used as a fixed forward firing gun or for use by an airplane's crew, such as a waist gun position on a B-17 . The M3 was a more purpose built variant for remote firing use, that also featured a higher rate of fire. This weapon was used on the XM14/SUU-12/A Gun Pod . The XM296/M296 is a further development of the M2/M3 machine gun for remote firing applications, and is currently only used in an Armament System for to the OH-58 Kiowa Warrior helicopter. The M296 differs from previous remote firing variants primarily in the lack of bolt latch allowing for single shots. The GAU-10/A (NSN or National Stock Number 1005-01-029-3428) has been identified as a member of the Browning M2 family through its inclusion in the June 2000 issue of ''Countermeasure'' (Vol 21, No 6, available online here ). ''Countermeasure'' is published by the Army Ground Risk Management Team, and identifies important issues that soldiers should be aware of with regards to risk management and safety. Beyond this connection, there is no specific information on the GAU-10/A, and it is odd that the only online reference would be from a US Army publication as this is a USAF designation. XM213/M213, XM218, GAU-15/A, GAU-16/A, and GAU-18/A The XM213/M213 was a modernization and adaptation of existing .50 caliber '''AN/M2s''' in inventory for use as a pintle mounted door gun on helicopters using the M59 Armament Subsystem . The GAU-15/A, formerly identified as the '''XM218''', is a lightweight member of the M2/M3 family. The '''GAU-16/A''' was an improved GAU-15/A with modified grip and sight assemblies for similar applications. Both of these weapons were used as a part of the A/A49E-11 Armament Subsystem . The GAU-18/A, is a lightweight variant of the M2/M3, and is used on the USAF's MH-53J Pavelow II and HH-60 Pave Hawk helicopters. These weapons do not utilize the heavy barrel, and are typically set up as left-hand feed, right-hand charging weapons. In this configuration the gun is fitted with a Chute adapter attached to its left hand feed pawl bracket. Thus, the weapon can receive ammunition through a feed chute system connected to internally-mounted ammunition cans. Originally designed to accommodate 1,700 rounds, these cans have since been modified due to space constraints, and now hold about half that amount. However, many aerial gunners find the chute system cumbersome, and opt to install a bracket accommodating the 100-round cans instead (as on the model pictured to the right). GAU-21 /A and M3P UH-1N in Iraq in 2003]] The FN produced M3 series is also in U.S. military service in two versions. One being a fixed remote firing version, the FN M3P, used on the Avenger Air Defense System . The U.S. Army would appear to use this designation for the weapon. The M3M flexible machine gun has been adopted by the USAF and the USN under the designation '''GAU-21/A''' for pintle applications on helicopters. M2 E-50 (M2E50) A long overdue upgrade program for existing infantry M2s and other M2s currently in U.S. Army service, the E50 finally provides a: Quick Change Barrel (QCB) capability, a rail accessory mount, an improved flash hider and a manual safety. The E50 designation initially appeared to be within the bounds of the normal U.S. Army designation system. However, it later turned out that the term was in fact a developmental project that stands for Enhanced 50, as in enhanced .50 caliber machine gun. Developed primarily as a conversion kit for existing weapons, it is likely that new production machine guns will be built to this standard. INTERNATIONAL USAGE The M2 family has also been widely used abroad, primarily in its basic infantry configuration. A brief listing of foreign designations for M2 family weapons follows: SEE ALSO
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