Rifle grenade

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Cutaway of M31 HEAT rifle grenade from US Army Field Manual FM 23-3 1972

A rifle grenade is a grenade that uses a rifle-based launcher to permit a longer effective range than would be possible if the grenade was thrown by hand.

The practice of projecting grenades with rifle-mounted launchers was first widely used during World War I and continues to the present, with the term "rifle grenade" now encompassing many different types of payloads including high explosive, fragmentation, and anti-tank warheads as well as concussion, smoke, incendiary, and flare missiles.

Rifle grenades have largely been superseded in the infantry fire support role by a combination of grenade launchers (typically affixed to rifles) and disposable anti-armor rockets.

History[edit]

Mills bomb N°23 Mk II, with rod for launch by rifle

Early use[edit]

Adaptation of grenades for use in rifles began around 1904. The first experiments are credited to a Japanese Colonel Amazawa, who experimented with rifle fired grenades during the Battle of Port Arthur in the Russo-Japanese War, and the idea was further used by the Spanish, though the French were the first to put it to widespread use during the trench warfare of World War I.[1]

In 1907, Martin Hale developed the rod grenade.[2] "A simple rod was attached to a specialized grenade, inserted into the barrel of a standard service rifle and launched using a blank cartridge."[2] The British did not immediately adopt the idea and entered World War I without any rifle grenades.[3] However, as soon as the trench warfare started, there was a sudden need for rifle grenades. The British government purchased a rodded variant of the No 2 grenade as a temporary solution.[3]

Drawing of the Mills N°36 rifle grenade, with its gas-check disk for use with cup-launcher

By 1915, Hales had developed the No 3, which is commonly known as the Hales rifle grenade.[4] The Hales grenade was improved throughout WWI to make it more reliable and easier to manufacture. However, production of the grenade was slow. In order to speed rod grenades to the front, the British also made rodded versions of the Mills bomb.

Although a simple approach, launching a rod grenade "...placed an extreme amount of stress on the rifle barrel and the rifle itself, resulting in the need to dedicate specific rifles to the grenade launching role, as they quickly became useless as an accurate firearm. This led to the search for an alternative and resulted in the reappearance of the cup launcher during the latter years of World War I".[2] After World War I, the rod-type rifle grenade was declared obsolete and the remaining Hales were replaced with gas-check equipped Mills Bombs shot from a rifle via a cup launcher.

German rifle Mauser M1898 with cup-type rifle grenade launcher

The French grenade, named the V-B grenade after its inventors, Vivien and Bessières, was fired from the standard service rifle with the use of a special adapter and a standard cartridge, providing an effective range of around 175 to 200 yards, while the effective radius of the bursting grenade was 75 yards. The grenade had a hollow through the middle, allowing the bullet to pass through, while the muzzle blast was captured by the launching device and used to propel the grenade. The bullet, after passing through the body of the grenade, struck a small plate that ignited primer. This then lit the fuse in the grenade, providing an eight second delay before detonation. It could be fired from the shoulder, but due to the heavy recoil and poor balance of the rifle fitted with the grenade, it was more common to fire it with the butt of the rifle resting on the ground, and either held at an appropriate angle, or resting on a tripod. The rifle grenade was useful in offense, particularly in attacking sandbag fortified machine gun nests, as well as in defense. Eight men armed with rifle grenades could fire 150 shots in a minute, providing a heavy barrage to break up an attacker's lines.[5][6][7][8]

Upon entering World War I, the United States attempted to adopt the V-B grenade, but this was not very successful. The difference between the French and American service cartridges (8 mm vs. 7.62 mm) meant that the grenade had to be re-designed with a smaller hole, but even this was not sufficient to ensure reliable functioning, due to differences in bullet design. The American bullet would often break apart in the grenade, and this led to the V-B derived grenade design being scrapped in May 1918.[6]

The next United States attempt at a rifle grenade was to return to and develop an improved rod-grenade. The Babbitt grenade, developed by Colonel E. B. Babbitt of the U. S. Ordnance Department, used a long stem projecting from the rear of the grenade, which was slipped into the barrel of the Springfield 1903 rifle, and propelled with a special blank cartridge. The stem was calibrated with a number of grooves and a split ring, which allowed the user to set the grenade to slide a certain distance into the muzzle of the rifle. With the stem was inserted only part way, the chamber pressure upon firing was reduced, propelling the grenade a shorter distance. When fired at a 45-degree angle, ranges from 50 to 300 yards were possible; with the rifle angled at 80 degrees, ranges as short at 15 yards were possible. In addition to providing the force to propel the grenade, the gases from firing were directed through a hollow in the stem, and provided force to arm the grenade. Once armed, the grenade had a heavy plunger that would detonate the grenade upon impact.[9][10]

After World War I[edit]

Japanese Type 91 50 mm grenade with screw-on propellant cartridge for use in a Type 89 grenade discharger

After World War I, the rifle grenade was steadily modified to increase its effectiveness when launched from the rifle.

In 1928 the Italian Army adopted an unusual cup-type 38.5 mm rifle grenade launcher bolted to the side of a normal Carcano 6.5 mm carbine, the Moschetto di Fanteria Mod. 91/28 con Tromboncino. In use, the rifle's bolt was removed and installed in the launcher chamber.[11] The rifle was placed butt-first against the ground, a grenade is loaded down the launchers muzzle and standard rifle round is loaded into the grenade launchers chamber.[11] When fired, the bullet is trapped, the neck of the cartridge case expands and the gases pass into launchers barrel through four holes providing the energy needed to launch the grenade.[11] After the grenade is launched, the chamber is opened ejecting the spent cartridge case and bullet falls out.[11] The necessity of changing the rifle bolt kept the rifle out of use until the bolt could be replaced, a slow and clumsy procedure. The bolt-changing procedure could also result in lost rifle bolts in the heat of battle, putting the weapon out of action completely. As a result, this design was not adopted by any other nation. Today, it can be seen as an early, if unsuccessful ancestor of modern under-barrel grenade launchers such as the M203.

Japanese soldier demonstrating the correct use of the Type 89 discharger

The Japanese military continued to experiment with rifle and hand-thrown grenades between the wars and would adopt a family of fragmentation grenades with almost universal adaptability. Introduced in 1931, the Type 91 fragmentation grenade could be thrown by hand, fired from a cup-type grenade launcher (the Type 100), discharged by a lightweight mortar-like projector (the Type 89 grenade discharger, or knee mortar).[12] or fitted with tail-fin assembly and fired from a spigot-type rifle grenade launcher.

The spigot-type grenade launchers were used by Japanese Naval Landing Forces to launch an anti-tank (hollow-charge) finned grenade. They were also used to propel Type 91 hand grenades fitted with tail-fin assemblies. These grenades had wood-bulleted launching cartridges stored in their tail-fin assemblies. The cartridges are fired from the rifle and the wooden bullets are trapped by the tail-fin assemblies launching and arming the grenades. These launchers are not numbered, and production figures are not available and examples of spigot grenade launchers are rarely encountered.

Japanese Type 2 grenade launcher and a 30 mm Type 2 hollow charge grenade (top) and a 40 mm Type 2 hollow charge grenade (bottom) used during the Second World War
A member of the British Home Guard demonstrates a rifle equipped to fire an No. 68 anti-tank grenade

The Type 89 grenade discharger was introduced in 1939, the Type 91 fragmentation grenade was fitted with a propellant base and time fuse. It did not explode upon contact, but was designed to ignite its fuse while in flight. A weak creep spring inside the grenade firing mechanism allowed the firing pin to be thrown back upon launching, igniting a time fuse with a 7-8 second delay. Using this system, the Type 91 grenades could be launched through jungle cover or through small openings without the danger of premature detonation in the event the grenade struck an object on its way to the target.[13] Although the Type 89 could be fired by a single person, it was typically operated with a crew of 3, enabling it to reach a rate of fire of about 25 rounds per minute.[14]

The Type 100 grenade discharger was introduced in 1939 as a grenade discharger on Arisaka Rifles for Type 91 and Type 99 hand-grenades. The launcher is somewhat unusual in that rather than using the more common cup designs it is a gas trap system, meaning that it incorporates a barrel extension which taps off excess propellent gases to launch the grenade from a cup offset from the barrel. This has the advantage that standard rifle cartridges could be used along with the standard hand-grenades which simplified logistics, at the expense of increased weight and decreased efficiency.

Britain put the first anti-tank grenade into the field during World War II in late 1940 with the No 68 AT Grenade, which was one of the first "of any" type anti-tank weapons with a shape charge or HEAT type warhead. The design of the warhead was simple and was capable of penetrating 52mm (2 inches) of armour in 1940.[15] The simple fins gave it some stability in the air and detonation occurred on impact.

In 1942, an attachable rifle grenade launcher called the Gewehrgranatengerät or Schiessbecher ("shooting cup") was introduced that was developed based on rifle grenade launcher models designed during World War I. The 30 mm Schiessbecher cup-type rifle grenade launcher could be mounted on any Karabiner 98k and was intended to replace all previous rifle grenade launcher models. The rifle grenade launcher could be used against infantry, fortifications and light armored vehicles up to a range of 280 m (306 yd). For these differing tasks, several specialized grenades with accompanying special propelling cartridges were developed for the 1,450,113 produced Schiessbecher rifle grenade launchers. The rifle grenade-propelling cartridges fired a wooden projectile through the barrel to the rifle grenade that, upon impact, automatically primed the rifle grenade. The Schiessbecher could be mounted on the Karabiner 98a, G98/40, StG 44 and FG 42

The Type 2 rifle grenade launcher was an attachment for the Japanese Type 38 and Type 99 rifles that allowed them to fire special hollow charge grenades. It was a version of the German Schiessbecher grenade launcher. Two grenades were produced for the launcher: a 30mm grenade and a larger 40mm grenade, both designated Type 2. The launcher sits over the end of the barrel, held in place with a clamping device. A special crimped blank cartridge or wooden bullet is used to fire the grenades.

Modern use[edit]

M7 grenade launcher with 22 mm grenade fitted on the end of an M1 Garand rifle

In the years just prior to World War II, the United States adopted the spigot-type 22mm rifle grenade launchers. Having come into wide acceptance during World War II, these rifle grenades were increasingly used in the years after the war. These 22mm grenade types range from powerful anti-tank rounds to simple finned tubes with a fragmentation hand grenade attached to the end. They come in "standard" type which are propelled by a blank cartridge inserted into the chamber of the rifle. And, the newer "bullet trap" and "shoot through" types, as their names imply use live ammunition.[16]

WWII American rifle grenades (From Left to Right): M1 Grenade Adapter with Mk.2 Fragmentation Grenade, M22 Smoke Rifle Grenade with Impact fuze, M17 Fragmentation Rifle Grenade with Impact-fuze, M2 Grenade Adapter with AN/M8 Smoke Grenade

After World War II, more and more countries began to adopted 22mm anti-tank rifle grenades with shaped-charge or HEAT warheads. The Belgian ENERGA anti-tank rifle grenade design in particular was widely adopted by Western nations. The bullet-trap rifle grenade design also saw increasing use during the years after World War II, most notably the French AC58 anti-armour and APAV40 multi-purpose grenades. The 22mm rifle grenade launchers were further simplified, becoming an integral part of the rifle itself. All current NATO rifles are capable of launching STANAG 22mm rifle grenades from their flash hiders without the use of an adapter.

By the late 1970s, rifle grenades and their launchers began to be replaced by dedicated grenade launchers. First seen in the United States armed forces, these grenade launchers generally took form of a separate weapons, such as the M79 grenade launcher. Or, as an under-barrel attachment to an assault rifle, such as the M203 grenade launcher attached to an M16 rifle.

Today, there is a return to the concept of the rifle grenade, such as the SIMON breach grenade, the IMI Refaim, FN Herstal Telgren and the Japanese Type 06 advance grenades. These grenades were designed to be used by ordinary riflemen as opposed to specially trained grenadiers. For example, the MECAR rifle grenades are equipped with simple ballistic sights and have an effective range of 300 meters.[17]

Japanese soldiers firing ENERGA practise grenades from Howa Type 64 rifles
Yugoslavian SKS with 22mm launcher attached to rifles muzzle and flip-up grenade sight

Modern combined arms doctrine dictates that every infantry unit should have a certain percentage of dedicated grenadiers, or soldiers equipped with a grenade launcher or combination rifle/grenade launcher. The criticism of this doctrine is that if the grenadiers in a group are disabled or separated from the group, then the group has completely lost the grenade launcher as a heavy fire support. With the addition rifle grenades, each soldier would be equipped with a small number of rifle grenades, so every individual soldier could use some form of heavy firepower. However, all of these rifle grenades add additional weight to the soldiers war-load and as a consequence they must reduce the amount rifle ammunition that they carry. For example, a modern French AC58 "bullet trap" rifle grenade weighs .5 kg, the equivalent of a loaded M16 STANAG magazine.

The AK-47 can mount the Kalashnikov cup-type grenade-launcher that uses standard Soviet RGD-5 hand-grenades. The soup-can shaped launcher is screwed onto to AK-47's muzzle.[18] The maximum effective range is approximately 150 meters.[19] The M16 has a similar device used to launch tear-gas hand-grenades.[20]

Comparison of performance[edit]

Performance of modern and historical rifle grenades
Name Introduced Length Weight Explosive fill Armor penetration (est.) Maximum range Effective range
No. 68 AT Grenade 1940 178 mm 894 g 156 g Lyddite, Pentolite or RDX/Beeswax 52 mm  ? m 100 m
M17 rifle grenade 1941 248 mm 667 g 57 g TNT NA 200 m  ? m
M9A1 HEAT anti-tank rifle grenade 285 mm 590 g 158 g TNT 100 mm 285 m 100 m
ENERGA anti-tank rifle grenade 1950s[clarification needed] 395 mm 645 g 331 g RDX & TNT 200 mm 300 m 100 m
Super Energa 425 mm 765 g 314 g PETN 275 mm 550 m 200 m
Denel R1M1 1970s[clarification needed] 425 mm 720 g  ? g RDX & Wax 275 mm 375 m 75 m
M31 HEAT rifle grenade 1950s[clarification needed] 430 mm 709 g 254 g Composition B 200 mm 185 m 115 m
AC58 380 mm 500 g  ? g hexogen-tolite 350 mm  ? m  ? m
APAV40 1956 352 mm 405 g 80 g hexogen-tolite 100 mm 320 m 170 m

Designs[edit]

Rod-type[edit]

The rod-type rifle grenade is a standard hand grenade with a metallic rod attached to the base. They were developed prior to World War One. To use:

  1. Insert the rod-type rifle grenade down the barrel of a standard rifle
  2. Insert a special blank cartridge into the rifle's chamber
  3. Place the rifle's butt-stock on the ground
  4. While holding the grenade's safety spoon with one hand, remove the safety pin with the other
  5. Place free hand on the rifle's grip and prepare to fire
  6. Release the grenade's safety spoon, quickly place said hand on the rifle's fore stock and immediately fire the rifle

If the soldier does not immediately launch the grenade, it will time out and explode. It was later found that the repeated launching of rod grenades caused damage to a rifle's barrel and the rod-type rifle grenade fell from favor.

Cup-type[edit]

The cup-type launcher replaced the rod-type rifle grenade during World War One. This soup-can shaped launcher is attached to a rifle's muzzle. The cup-type launcher could launch a standard hand-grenade or a purpose built cup-type grenade. To use:

  1. Insert a grenade into the cup launcher. When using a standard hand-grenade remove the safety pin, the cup holds the safety-spoon in place until launched
  2. Insert a special blank cartridge into the rifle's chamber
  3. Place the butt-stock of the rifle on the ground and fire from this position

"Shoot-through" type[edit]

The cup-type launcher has the advantage of using standard hand-grenades. However, the need to load a blank cartridge into the rifle's chamber in order to launch the grenade proved to be clumsy in combat. This difficulty lead to the development the French "Vivien and Bessières" shoot-through grenade (or VB grenade). As the name implies, these grenades allow for the use of live ammunition. The VB grenade has a hole through the middle that permits the passage of a standard bullet; this arms the grenade, the expanding gasses launch the grenade, and the grenade explodes 8 seconds later. This removes the need to provide a special blank round to launch the grenade. To use:

  1. Insert VB grenade into the cup-type launcher
  2. Place the butt-stock of the rifle on the ground and fire from this position

Spigot-type[edit]

The 22mm type rifle grenade launcher was developed prior to World War Two. This type of launcher is attached to a rifle's muzzle and allows for the use of a wide range of rifle grenades, from powerful anti-tank rounds to simple finned tubes with a fragmentation hand-grenade attached to the end. These rifle grenades come in "standard" type, which are propelled by a blank cartridge inserted into the chamber of the rifle. Or, "bullet trap" and "shoot through" types, which allow the use live ammunition. All modern 22mm rifle grenade explode on impact. All Standard issue NATO rifles are capable of launching STANAG type 22mm rifle grenades from their integral flash hiders without the use of an adapter. Modern bullet-trap rifle grenades such as the French APAV40 can be fired as fast as a soldier can place a grenade on an FAMAS rifle's muzzle and pull the trigger. To use:

  1. Place 22mm rifle grenade over the spigot attachment or the rifle's flash hider
  2. Aim at target and fire rifle

Other uses and similar devices[edit]

A riot control grenade in a launching cup attached to a Mossberg 500 riot shotgun
German propaganda rifle grenade

The advent of less lethal grenades for riot control has led to the creation of gun launched versions of these grenades, though they are typically launched by riot shotguns, not rifles. These systems use a cup-type launcher attached to the muzzle of the gun to launch various less lethal grenade types.[21]

During the Second World War, Nazi Germany developed and fielded a propaganda rifle grenade (Gewehr Propaganda Granate). It was designed for front-line troops to disperse propaganda leaflets via a rifle grenade that, on impact, would disperse the printed material via a small ejecting charge.[22]

A golf ball launcher is a cup-type launcher which is used for sport or recreational purposes. These launcher will shoot a standard golf ball over 250 yards with little to no recoil. These launchers are designed to replace an AR-15 type rifle's flash hider.[23]

Advantages and disadvantages[edit]

Compared to a standard hand-grenade, a rifle grenade:

  • Can be projected to a much greater distance
  • Can carry a larger, heavier payload
  • Can effectively project a shaped charge warhead which can penetrate armor
  • Has the advantage of detonating upon impact
  • Is more accurate

However, a rifle grenade:

  • Requires a rifle to launch
  • Is more complicated to use than a hand grenade.
  • Is larger and heavier than a hand grenade.
  • Produces very high levels of recoil when launched from a rifle.

Compared to a dedicated grenade launcher, a rifle grenade:

  • Can be of a variety of different sizes and shapes of warheads and payloads
  • Can be projected from any rifle fitted with an appropriate muzzle base or spigot tube fitting; in essence, every soldier armed with a rifle can be a grenadier
  • Can fire up to 20 grenades per minute for area suppression, for a modern bullet-trap rifle grenade

However:

  • A rifle grenade will temporarily disable the normal use of the rifle
  • A dedicated grenade launcher can be fired from the shoulder without undue discomfort, something not normally possible with a rifle grenade
  • A soldier armed with a dedicated grenade launcher can carry 2 to 3 times more grenade ammo than rifle grenades
  • A dedicated grenade launcher is more accurate than a rifle grenade

Compared to a rocket launcher, a rifle grenade:

  • Has a curved trajectory, allowing indirect fire against targets in defilade, behind walls and buildings or rooftops
  • Is much lighter and does not require the user to carry a bulky launcher tube

However:

  • Rocket launchers have a flatter trajectory making them more accurate "point-and-shoot" weapons
  • Rocket launchers generally have more powerful warheads
  • Rocket launchers generally have a longer effective range

See also[edit]

References[edit]

  1. ^ Cornélis De Witt Willcox, Edwin Roy Stuart. The International Military Digest Annual. p. 236. 
  2. ^ a b c "Evolution and Demise of the Rod Grenade". Inert-Ord.net. 2003-01-31. Retrieved 2013-10-06. 
  3. ^ a b Saunders, Weapons of the Trench War, p.97-99
  4. ^ Saunders, Weapons of the Trench War, p.98
  5. ^ Walter Hines Page, Arthur Wilson Page (1918). The World's Work: A History of Our Time. Doubleday, Page & Co. p. 501. 
  6. ^ a b United States War Dept. America's Munitions 1917-1918. pp. 208–209. 
  7. ^ Anne Cipriano Venzon, Anne Venzon, Paul L. Miles (1999). The United States in the First World War: An Encyclopedia. Taylor & Francis. p. 172. 
  8. ^ Robert B. Asprey. At Belleau Wood. p. 19. 
  9. ^ United States Army. Ordnance Dept, Ordnance (1917). Description and Instructions for the Use of Rifle and Hand Grenades. 
  10. ^ William Harvey Tschappat (1917). Text-book of Ordnance and Gunnery. John Wiley & Sons, Inc. p. 511. 
  11. ^ a b c d http://www.il91.it/moschetto_ts_tromboncino_28.html
  12. ^ George, John B. (LTC), Shots Fired In Anger, NRA Press (1981), ISBN 0-935998-42-X, p. 343
  13. ^ George, John B. (LTC) (1981). Shots Fired In Anger. NRA Press. p. 350. ISBN 0-935998-42-X. 
  14. ^ Japanese Ordnance Material of WW II at the Wayback Machine (archived December 9, 2004)
  15. ^ R F Eather, BSc & N Griffithe, OBE MSc - Some Historical Aspects of the Development of Shaped Charges - Ministry of Defence, Royal Armament Research and Development Establishment - 1984 - page 6 - AD-A144 098
  16. ^ Franklin D. Margiotta, Gordon R. Sullivan (1997). Brassey's Encyclopedia of Land Forces and Warfare. Brassey's. p. 40. ISBN 1-57488-087-X. 
  17. ^ http://www.mecar.be/content.php?langue=english&cle_menus=1156765282
  18. ^ Figure 54 of the US Army Operator's Manual for the AK-47 Assault Rifle. En.wikisource.org. Retrieved on 2011-09-27
  19. ^ [1][dead link]
  20. ^ Imageshack.us. Retrieved on 2011-09-27
  21. ^ MILITARY POLICE INSTRUCTION COMPANY (14 August 2007). "INSTRUCTOR OUTLINE Civil Disturbance Lesson Plan". UNITED STATES MARINE CORPS.  (Word document)
  22. ^ grenade.html "German Propaganda Rifle Grenade, WWII Tactical and Technical Trends, No. 43, January 27, 1944". Lone Sentry. Retrieved 2013-10-06. 
  23. ^ http://www.tromix.com/GBLauncher.pdf

External links[edit]