MG 42 (top)
|Type||General-purpose machine gun|
|Place of origin||Nazi Germany|
|Wars||World War II
Portuguese Colonial War
Syrian Civil War
Mauser Werke AG
|Produced||1942–1945 (Nazi Germany)|
|Variants||MG 45/MG 42V, MG 1, MG 2, Rheinmetall MG 3, M53, MG 74|
|Weight||11.57 kg (25.51 lb)|
|Length||1,220 mm (48 in)|
|Barrel length||533 mm (21.0 in)|
|Rate of fire||1,200 rounds/min (varied between 900–1,500 rounds/min with different bolts)|
|Muzzle velocity||740 m/s (2,428 ft/s) (s.S. Patrone)|
|Effective firing range||200–2,000 m (219–2,187 yd) sight adjustments
3,500 m (3,828 yd) with tripod and telescopic sight
|Maximum firing range||4,700 m (5,140 yd)|
|Feed system||50 or 250-round belt|
|Sights||Iron sights, antiaircraft sight or telescopic sights|
The MG 42 (shortened from German: Maschinengewehr 42, or "machine gun 42") is a 7.92×57mm Mauser general purpose machine gun designed in Nazi Germany and used extensively by the Wehrmacht and the Waffen-SS during the second half of World War II. It was intended to replace the earlier MG 34, which was more expensive and took much longer to produce, but in the event, both weapons were produced until the end of the war.
The MG 42 has a proven record of reliability, durability, simplicity, and ease of operation, but is most notable for its ability to produce a high volume of suppressive fire. The MG 42 had one of the highest average cyclic rates of any single-barreled man-portable machine gun: between 1,200 and 1,500 rpm, resulting in a distinctive muzzle report compared to the sound of a power saw or tearing linoleum.
The MG 42's lineage continued past Nazi Germany's defeat, forming the basis for the nearly identical MG1 (MG 42/59), chambered in 7.62×51mm NATO, which subsequently evolved into the MG1A3, and later the Bundeswehr's MG 3. It also spawned the Swiss MG 51, Zastava M53, SIG MG 710-3, Austrian MG 74, and the Spanish 5.56×45mm NATO Ameli light machine gun, and lent many design elements to the American M60 and Belgian MAG. The MG 42 was adopted by several armed organizations after the war, and was both copied and built under licence.
|This section's factual accuracy is disputed. (July 2016) (Learn how and when to remove this template message)|
As a result of signing the Treaty of Versailles, Germany was forbidden to make the heavy water-cooled machine guns that had proven to be very effective during World War I. As a result, German engineers developed a new light machine gun which could produce a high level of fire over a long period of time. The MG 34 was issued with 6 additional interchangeable barrels. The three-man crew that served the weapons was also issued asbestos gloves to use when changing the barrel. As a result, the sustained rate of fire was very high. The MG 34 was so accurate that it was often mounted on a tripod with a telescopic sight for sniping at very long distances. It was chambered in the standard 7.92×57mm Mauser cartridge (often called 8mm).
In German army tactics, the machinegun was supported by the entire squad. Each man would carry belts of 7.92×57mm Mauser for the machine gun. US tactics put the machinegun and its crew largely alone with far less support or emphasis on use. A German squad's purpose was to protect the machine gun, while a US squad's purpose used the machine gun to support the men. In addition to the 6 barrels carried for the MG 34, the squad carried at least 1800 rounds of 7.92×57mm Mauser in belts ready to use.
In 1934, the German Army introduced the MG 34, considered to be the first modern general-purpose machine gun. Equipped with a quick-change barrel and fed either with belts, or from 50-round or 75-round spring-loaded saddle-drum Patronentrommel 34 magazines (with a simple change of feed cover), the MG 34 could sustain fire for much longer periods of time than other portable squad-level weapons such as the American B.A.R. and the British Bren Gun, both of which were fed by box magazines, while also being much lighter and more portable than crew-served weapons like the Browning M1919 or Vickers machine guns (which also lacked quick-change barrels). The MG 34 was also quite versatile; not only was it able to be fed from belted ammunition or a saddle drum magazine, it could also be fired from a bipod, heavy tripods or various pintle mounts for armored vehicles. Switching between a bipod and a tripod required no special tools, as the mounting latch was spring-loaded. Later in the war, the MG 34 was used as the basis for the Luftwaffe's MG 81 flexible defensive gun, and as the MG 34 Panzerlauf, it was used throughout the war as secondary armament on panzers and other vehicles. However, it did have its drawbacks, such as sensitivity to dust and comparatively expensive production. One attempt at improvement was the MG 34S, an incremental improvement on the basic 34 design.
In order to address these issues, a contest was held for a true MG 34 replacement. Three companies were asked to submit designs: Metall und Lackierwarenfabrik Johannes Großfuß AG of Döbeln, Rheinmetall-Borsig of Sömmerda, and Stübgen of Erfurt. Of the number of proposals submitted, Großfuß AG's proved to be the best design by far, employing a unique recoil-operated roller locking mechanism whereas the two competing designs used a gas-actuated system. Interestingly, the company had no earlier experience in weapons manufacture, specializing in pressed and stamped steel components (the company's staple product was sheet metal lanterns). Dr.-Ing. Werner Gruner, one of the leading design engineers with Großfuß, knew nothing about machine guns when he was given the task of being involved with the project, although he specialized in the technology of mass production. Gruner would attend an army machine gunner's course to familiarize himself with the utility and characteristics of such a weapon, also seeking input from soldiers. He then recycled an existing Mauser-developed operating system and incorporated features from his experiences with army machine gunners and lessons learned during the early stages of the war. Being made out of stamped metal, the new design required considerably less tooling and was much simpler to build than other machine guns—it took 75 man hours to complete the new gun as opposed to 150 man hours for the MG 34 (a 50% reduction), and cost 250 RM as opposed to 327 RM (a 24% reduction).
The resulting MG 39 remained similar to the earlier MG 34 overall, a deliberate decision made to maintain familiarity. The only major changes from the gunner's perspective were dropping of most of the drum-feed options, leaving the weapon to fire with a loose belt of ammunition, or from a single 50-round drum-shaped Gurttrommel belt container fitted to the gun's receiver, and simplifying the weapon's open sights for aiming purposes. All these changes being intended to increase, maintain, or accommodate the gun's high practical rate of fire. Although made of relatively inexpensive and simple parts, the prototypes also proved to be considerably more rugged and resistant to jamming than the precisely machined and somewhat temperamental MG 34. A limited run of about 1,500 of its immediate predecessor, the MG 39/41, was completed in 1941 and tested in combat trials.
The weapon was officially accepted, and the main manufacturing of the production design began in 1942, as the MG 42, contracts going to Großfuß, Mauser-Werke, Gustloff-Werke and others. Production during the war amounted to over 400,000 units (17,915 units in 1942, 116,725 in 1943, 211,806 in 1944, and 61,877 in 1945).
One of the weapon's most notable features was in its exceptionally high rate of fire of about 1,200 to 1,500 rounds per minute, twice the rate of the Vickers and Browning machine guns, which fired at a rate of about 600 rounds per minute. The ear could not easily discern the sound of individual shots being fired, instead hearing a sound described as like "ripping cloth" or a buzzsaw, giving rise to the nickname "Hitler's buzzsaw" (and the German soldiers' Hitlersäge ("Hitler's saw" or "buzzsaw"). The gun was sometimes called "Spandau" by British troops, as was the MG 34, a traditional generic term for all German machine guns, left over from the famous Allied nickname for the MG 08 Maxim-derivative used by German forces during World War I, which was derived from its manufacturer's plates noting the city where some were produced.
citation needed] and quickly overheated its barrel, making sustained fire problematic. Thus, while individual bursts left the weapon as highly concentrated fire at 1,200 to 1,500 rounds per minute, the Handbook of the German Army (1940) forbade the firing of more than 250 rounds in a single burst and indicated a sustained rate of no more than 300–350 rounds per minute to minimize barrel wear and overheating, although the quick-change barrel design mitigated this problem somewhat. Burst limits are typical on non-water-cooled automatic weapons, and slower-firing Allied guns such as the M1919 also had limits; they fired at a slower rate, but lacked a quick-change barrel, and so the operator had to limit his fire to a few hundred rounds per minute to allow the barrel to cool between bursts. Due to the slower firing rate, this led to a longer period of time spent shooting, but a roughly equivalent total number of rounds fired. Operationally, the MG 42's main drawback was that it could consume ammunition at such a high rate that it was very difficult to keep firing during offensive actions, because ammunition had to be carried forward on a continuous basis. This was also a problem at the end of the war with inexperienced German troops. Good fire discipline was necessary, and the level of training that the German infantry was receiving at that time was poor.[
The method of barrel change made the MG 42 unsuitable for secondary or co-axial armament on World War II era German tanks with the exception of the Jagdpanzer IV. Early versions of the Jagdpanzer IV carried two standard (no modification made) MG 42s on both sides of the gun mantlet/glacis, firing through a ball slot which was protected by an armored cover (with the MG 42 retracted) when not in use. Later version Jagdpanzer IVs carried only one MG 42 on the left side.
In the German heavy machine gun (HMG) platoons, each platoon served four MG 34/MG 42 machine guns, used in the sustained fire mode mounted on tripods. In 1944 this was altered to six machine guns in three sections with two seven-man heavy machine gun squads per section as follows:
- Squad leader (NCO) MP40
- Machine gunner (private) MG 34/MG 42 and pistol
- Assistant gunner (private) pistol
- Three riflemen (privates) rifles
- Horse leader for horse, cart and trailer (private) rifle
The MG 42's effect was so devastating that Allied troops were trained before the D Day landings to distinguish its unique sound when fired, which was like cloth being ripped or the sound of a buzzsaw. Allied troops were trained to charge an MG-42-equipped pill box only at the time of its one weakness, which was when its overheating barrel needed to be changed.
German small arms doctrine
While the Americans had standardized a semi-automatic rifle in 1936 (the M1 Garand), the German military kept issuing Karabiner 98k bolt-action rifles due to their tactical doctrine of basing a squad's firepower on the general-purpose machine gun in the light machine gun role so that the role of the rifleman was largely to carry ammunition and provide covering fire for the machine gunners. The German military did experiment with semi-automatic rifles throughout World War 2 and fielded the Gewehr 41 series of which less than 150,000 were built, the Gewehr 43/Karabiner 43 series of which 402,713 where built, and introduced the first assault rifle in 1943 – the MP43 / MP44 / StG 44 series, of which 425,977 were built. Due to the relatively limited production of semi-automatic and assault rifles, the Karabiner 98k of which over 14,600,000 were built remained the primary service weapon until the last days of World War II, and was manufactured until the surrender in May 1945.
The MG 42 weighed 11.6 kg in the light role with the bipod, lighter than the MG 34 and easily portable. The bipod, the same one used on the MG 34, could be mounted to the front or the center of the gun depending on where it was being used. For sustained fire use, it was matched to the newly developed Lafette 42 tripod.
The optimum operating crew of an MG 42 for sustained fire operation was six men: the gun commander, the No.1 who carried and fired the gun, the No.2 who carried the tripod, and Nos. 3, 4, and 5 who carried ammunition, spare barrels, entrenching tools, and other items. For additional protection the commander, No.1 and No.2 were armed with pistols, while the remaining three carried rifles. This large team was often reduced to just three: the gunner, the loader (also barrel carrier), and the spotter. The gunner of the weapon was preferably a junior non-commissioned officer (or Unteroffizier).
The Allied army doctrines of the era centered on the rifleman, with the machine gun serving a support role, and they utilised weapons with rates of fire of typically 450–600 rpm. The Allied nations had machine guns with similar rates of fire, but mounted them almost exclusively in aircraft, where the fleeting opportunities for firing made such high rates necessary. The only similar Allied weapon was the Vickers K aircraft gun, and that was used by ground forces only in specialized circumstances. German doctrine was the reverse, with the machine gun placed in a central role and rifleman employed in support. This meant that German forces deployed far more machine guns per equivalent-sized unit than the Allies, and that Allied troops assaulting a German position almost invariably faced the firepower of the MG 42. It was possible for operating crews to lay down a non-stop barrage of fire, ceasing only when the barrel had to be replaced. This allowed the MG 42 to tie up significantly larger numbers of enemy troops. Both the Americans and the British trained their troops to take cover from the fire of an MG 42, and assault the position during the small window of barrel replacement, which took around 5 to 7 seconds (estimated). The high rate of fire of the MG 42 sometimes proved a liability mainly in that, while the weapon could be used to devastating effect, it could quickly exhaust its ammunition supply. For this reason, it was not uncommon for all soldiers operating near an MG 42 to carry extra ammunition, thus providing the MG 42 with a backup source when its main supply was exhausted.
One of the disadvantages to using the MG 42 was that the high rate of fire lead to the barrel overheating frequently. After around 150 rounds of continuous fire, the gun operator would open a side hatch (leading to the barrel) and replace the overheated barrel with a new one. The machine gun crew member responsible for a hot barrel change was issued protective asbestos gloves to prevent getting burned.
The roller-locked bolt assembly consists of a bolt head, two rollers, a striker sleeve, bolt body, and a large return spring, which is responsible for pushing the bolt assembly into battery (the locked position) and returning it there when it is unlocked and pushed backwards by the recoil of firing or by the charging handle. As the striker sleeve is movable back and forth within the bolt assembly, the return spring is also responsible for pushing the striker sleeve forward during locking (described below). The bolt assembly locks with the barrel's breech (the end the cartridge is loaded into) via a prong type barrel extension behind the breech. As it is recoil-operated and fired from an open bolt, the weapon must be manually charged with the side-mounted charging handle.
The roller-locked recoil operation functions as follows: two cylindrical rollers, positioned in tracks on the bolt head, are pushed outwards into matching tracks in the barrel extension by the striker sleeve and lock the bolt in place against the breech. Upon firing, rearward force from the recoil of the cartridge ignition pushes the striker assembly back and allows the rollers to move inwards, back to their previous position, unlocking the bolt head and allowing the bolt assembly to recoil, extracting the spent cartridge and ejecting it down. The return spring then pushes the bolt assembly forwards again, pushing a new cartridge out of the belt into the breech, and the sequence repeats as long as the trigger is depressed. The MG 42 is only capable of fully automatic fire. Single shots are difficult, even for experienced operators, due to the weapon's rate of fire. The usual training objective is to be able to fire a burst of no more than three rounds. The weapon features a recoil booster at the muzzle to increase rearwards force due to recoil, therefore improving functional reliability and rate of fire.
The shoulder stock is designed to permit gripping with the left hand to hold it secure against the shoulder. Considerable recoil otherwise causes the stock to creep from its intended position. If the weapon is not properly "seated" on the bipod, a prone gunner may be pushed back along the ground from the high recoil of this weapon.
The sighting line consists of a ∧-type post or an inverted "V" height adjustable front sight on a folding post and a leaf rear sight with an open V notch sliding on a ramp, graduated from 200 to 2,000 meters (219 to 2,187 yards). There is an antiaircraft rear peep sight hinged on the open rear sight base. An auxiliary anti-aircraft ring sight is kept in the maintenance kit, and fitting on the barrel jacket to be used in conjunction with the folding antiaircraft rear peep sight attached to the rear sight base.
The barrel of the MG 42 could be quickly changed by the machine gun crew and weighed 1.8 kg (4.0 lb). The barrels could have traditional rifling or polygonal rifling. Polygonal rifling was an outgrowth of a cold-hammer forging process developed by German engineers prior to World War II. The process addressed the need to produce more durable machine gun barrels in less time than those produced with traditional methods. Some barrel bores featured hard-chrome plating to make them more durable. The different versions made that the service life of an MG 42 barrel varied between 3,500 to 8,000 rounds.
The MG 42 incorporated lessons hard-won on the Eastern Front. Both the cocking handle and the catch for the top cover to the working parts were designed so that the gunner could operate them wearing artic mittens or with a stick or rod. This was vital for winter conditions where contact by bare flesh on cold metal could cause severe injury, such as instant frostbite. The MG 42 also functioned well in other climates; dust and dirt in North Africa and Italy was less likely to jam the MG 42 then the more temperamental MG 34.
Lafette 42 tripod
For the medium machine gun role a large tripod, the Lafette 42, was available that included a number of features, such as recoil absorbing buffer springs, MG Z 34 or MG Z 40 periscope-type telescopic sight containing special sighting equipment for indirect fire, or the late World War II MG Z 44, designed for direct fire only. An accessory to lengthen these sights' periscope was available to use these sights behind cover. It could be set up in a prone, kneeling or high position. The Lafette 42 weighed 20.5 kg (45.2 lb) on its own and was a simplified version of the Lafette 34 used for the MG 34, as the MG 42 could be operated more easily from a Lafette and featured no semi-automatic firing mode. The legs could be extended with a Lafetteaufsatzstück to allow it to be used in the anti-aircraft role, and when lowered, it could be placed to allow the gun to be fired "remotely" while it swept an arc in front of the mounting with fire. Mounted to the Lafette and aimed through the telescopic sight, the effective range of the MG 42 could be extended out to 3,500 m (3,828 yd) when fired indirectly.
Another unique feature of German World War II machine guns (which continued to be used by the German Bundeswehr after the war) was the Tiefenfeuerautomat feature on the Lafette 42 tripod. If selected, this feature mechanically controlled the rise and fall of the gun, elevating the gun for five rounds and then depressing it for four rounds. It lengthened the beaten zone by walking the fire in wave like motions up and down the range in a predefined area. The length of the beaten zone could be set on the Tiefenfeuerautomat. For example, being unsure whether the real distance was 2,000 or 2,300 m (2,187 or 2,515 yd), the gunner could make the mount do an automatic sweep between the elevations for 1,900 to 2,400 m (2,078 to 2,625 yd) and back. This sweeping of a selected beaten zone continued as long as the gun fired.
Variants and developments
In 1944, the material shortages of the Third Reich led to the development of a newer version, the MG 45 (or MG 42V), which had a different operation mechanism that used delayed blowback as opposed to roller locking. For this reason, the MG 45 is considered a different type of firearm, as the mechanisms of these two guns are different. It used steel of lesser quality, which reduced weight to 9 kg, while retaining the horizontal cocking handle. First tests were undertaken in June 1944, but development dragged on and eventually only ten were built. The tested MG 45/42V fired 120,000 rounds in succession at a rate of fire around 1,350 rounds per minute. The MG 42V had some influence in the post-war development of roller-delayed blowback system, as employed in modern Heckler & Koch small arms.
T24 machine gun
The American military copied the MG 42 during the war as a possible replacement for the Browning Automatic Rifle and M1919A4 for infantry squads, the new version being chambered in the .30-06 cartridge. Saginaw Steering Gear constructed a working prototype designated as the T24 machine gun. It could also be used on an M2 Tripod. The gun was made as an exact copy of the MG 42 which was chambered in 7.92 x 57mm Mauser Caliber. The only change was to use a barrel chambered in .30-06. The 7.92 x 57 was 300 foot pounds more powerful with a larger bullet, so the suggestion that Saginaw Steering gear abandoned the project because .30-06 is more powerful is untrue. The 7.92 was ballistically superior.
When the prototype was fired at Aberdeen Proving Ground, it fired only one shot and failed to eject the cartridge. A second attempt had the same result. The engineers had made no adjustment to the design to accommodate the longer .30-06 cartridge. The US Army wanted to be able to manufacture this gun because it was so much cheaper to make than current guns. However this never took place. German weapons designers adopted a philosophy during World War II of making guns which could be more efficiently manufactured. The MG 42 was a prime example.
When US soldiers first saw the gun it was ridiculed for its use of stamped steel parts, until it was realized how much quicker and more cheaply guns of this type could be manufactured.
In Yugoslavia this MG 42 variant was built at the state-owned Zavodi Crvena Zastava company as the M53 machine gun using original German machinery, retaining the 7.92×57mm Mauser caliber. By doing so, the Yugoslavs retained the original weapon's design features, making the M53 a near exact copy of the German MG 42. The only major differences are a slower rate of fire and no anti-aircraft sight mount. The aiming range of the M53 is 2,000 m (2,187 yd), and the terminal range of the bullet is 5,000 m (5,468 yd), the same as the MG 42. MG 42s captured in Yugoslavia at the end of World War II were put into reserve of Yugoslav People's Army as M53/42s. The last military use of M53s in Yugoslavia was in 1999. Some quantities of M53s were exported to Iraq in the 1980s and saw extensive action during both Gulf wars. There is evidence that some M53s are still being used by Peshmerga forces in northern Iraq in the ongoing war against ISIS. M53 was known under the nickname Šarac (Шарац).
The MG 42, with small modifications, resulted in the Beretta MG 42/59—still used by the Italian Army—and Rheinmetall MG 3, which is the primary general-purpose machine gun of the modern German armed forces (Bundeswehr). A number of other armies around the world have adopted versions of the original, especially the MG3, and it remains in widespread service today. Its belt-feed mechanism was copied and used in the design of the M60 machine gun. The trigger mechanism of the FN MAG or MAG-58 is a virtual copy of the MG 42's and the MAG-58's belt-feed is also very similar.
Rate of fire varies from 900 rounds/min to 1,500 round/min or more depending on installed bolt weight (different weight bolt components introduced to regulate rate of fire, lighter assemblies providing faster rates of fire). Throat erosion and component wear also introduced significant variation. Rate of fire is up to 1,800 round/min on the MG 45 or without "recoil booster" (Rückstoßverstärker).
The final variant to date is the MG 74, developed by Austria and since 1974 it is the standard machine gun of the Austrian Armed Forces.
After its founding in 1955, the Austrian army was equipped with old guns temporarily out of U.S. stocks. Starting in 1959 these Browning M1919 were largely replaced by the MG 42 with modified barrel and bolt for the new 7.62mm NATO caliber. But to introduce a modern weapon of its own production the Office of Defence Technology, in cooperation with Steyr Mannlicher and Beretta developed a gun specifically for the Austrian Army. The German MG 42/59 that was introduced in 1959 with the Bundeswehr to replace the U.S. machine guns, served as the basis, which was similar to the Austrian 7.62 mm MG 42. Targets were to reduce, among other things, the rate of fire and weight and have more versatile sights and mount. The development of the weapon was completed in 1974. It replaced from this year the MG 42 as the MG 74 of the Austrian Federal Army.
The modifications to the basic MG 42 design include an extremely heavy bolt (950 grams vs. the 675 gram MG 3 bolt) which reduces the rate of fire to around 850 rounds per minute. Rate of fire can be varied, if necessary, by changing the shutter. In addition, a select fire trigger group was added to allow semi-automatic fire (single shot) compared to the traditional fully automatic only fire capability of the original MG 42 design. The MG 74 also has a modern polymer stock and handgrips to save weight. Usually colored a dark green, adjustable rear sight (35° horizontal, vertical 15°) and additional anti-aircraft sight can be mounted optional.
- FG 42
- MG 34
- MG 51
- CETME Ameli, Spanish GPMG
- MG3, modern successor of the MG 42
- ShKAS machine gun, Soviet aircraft ordnance, only Allied machine gun that could fire faster than the MG 42
- SIG MG 710-3, Swiss GPMG derived from the MG 42
- Vickers K machine gun
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