A grenade launcher or grenade discharger is a weapon that launches a specially-designed grenade or a grenade cartridge with more accuracy, higher velocity, and to greater distances than a soldier could throw it by hand.
Grenade launchers can either come in the form of standalone weapons (either single-shot or repeating) or attachments mounted under the barrel of a rifle. Some rifles have been designed to fire rifle grenades, either from their muzzle or from a detachable muzzle-mounted launcher. Larger grenade launchers, such as the Mk-19, may be mounted on vehicles.
Today, most grenade launchers are man-portable, shoulder-fired weapons issued on a squad level, although larger launchers are issued at the company or battalion level. The most common grenade-round in use by NATO is the 40 mm fragmentation grenade, which is effective against a wide range of targets, including infantry and lightly armored vehicles. The ability of the grenade launcher to loft payloads in a high arc has resulted in many "specialty" grenades, such as less-lethal sponge grenades, flares, and even a video camera that surveys the battlefield from a bird's-eye view.
The Type 10 grenade discharger (十年式擲弾筒 Juu-nen-shiki tekidantō?) and Type 89 grenade discharger (八九式重擲弾筒 Hachikyū-shiki jū-tekidantō?), colloquially known as a knee mortars by Allied forces, were Japanese grenade launchers or light mortars that were widely used in the Pacific Ocean theatre of World War II.
The Japanese Army, noting that grenades were short-ranged weapons, began efforts to optimize these weapons for close-in infantry fighting. After studying the use of grenades and mortars on the battlefield, the Japanese Army developed hand grenades, rifle grenades, and grenade dischargers (small mortars) suited to warfare in typical short-range combat environments, such as urban, trench, and jungle warfare.
As part of this effort, by 1932, the Japanese Army had adopted a set of fragmentation grenades with almost universal adaptability. 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 grenade discharger. or fitted with finned tail-assembly and fired from a spigot-type rifle grenade launcher.
Many grenades have been designed to launch from a rifle's muzzle, usually using either a special blank propellant cartridge, or more modern "bullet trap" and "shoot through" types, which allow the grenade to be fired using live rounds. This system has two key advantages: the grenade can generally be made larger and more powerful as compared to underbarrel or standalone weapons, and the rifle's weight and handling characteristics are not affected as with underbarrel systems.
The disadvantage of this method is that when a soldier wants to launch a grenade, he must mount the grenade to the muzzle prior to each shot. If he is surprised by a close-range threat while preparing to fire the grenade, he has to reverse the procedure before he can respond with rifle fire. Rifle grenades also tend to be more difficult to fire accurately compared to under-barrel or standalone designs. The IMI Refaim represents an advancement in technology as it uses an air-burst telescopic bullet trap rifle grenade with point detonation, time delay and self-destruct functions. The grenade is launched by a standard rifle bullet and the soldier can continue to engage threats with rifle fire if he has the need. This is based on the older SIMON breach grenade, which is a muzzle-fired grenade for breaching doors. The SIMON launches using a bullet trap to capture a standard 5.56 bullet fired from an M4 carbine or M16.
The shoulder fired 40mm grenade launcher can come in the form of either a single-shot weapon or a repeating weapon resembling a large revolver or pump-action shotgun. Examples include the M79 (single-shot), Heckler & Koch HK69A1 and the Milkor MGL (revolver). They fill the gap between the hand grenade and the mortar.
Modern developments tend toward faster-firing grenades with a smaller blast radius to reduce collateral damage. The XM25 CDTE is a shoulder-fired, magazine-fed semi-automatic launcher firing 25 mm projectiles. It was originally a component of the XM29 Objective Individual Combat Weapon program, but modified to a larger caliber. A 12 gauge grenade round called the Frag-12 has also been developed for the Atchisson Assault Shotgun.
Since grenade launchers require relatively low internal pressure and only a short barrel, a lightweight launcher can be mounted under the barrel of a traditional rifle. This reduces the weight the soldier must carry by eliminating the grenade launcher's buttstock and makes the grenade launcher available for use at a moment's notice.
Underbarrel 40mm grenade launchers generally have their own trigger group; to fire, one simply changes grips, disengages the safety, and pulls the trigger. In Western systems, the barrel slides forward or pivots to the side to allow reloading; most fire a 40×46mm grenade cartridge.
Soviet/Russian launchers are instead loaded from the muzzle, with the cartridge casing affixed to the projectile in the style of a mortar shell. For aiming, underbarrel grenade launchers typically use a separate sight attached to the rifle's frame alongside the iron sights, or attach a flip-up sight directly to one of the rifle's sights.
A late development is the 3GL from Metal Storm. As with most Metal Storm products, this weapon contains three electrically ignited grenades stacked front-to-back in a single tube to eliminate reloading.
An automatic grenade launcher or grenade machine gun fires rounds in quick succession from an ammunition belt or large-capacity magazine. They can be attached to a tripod. Automatic launchers include the Mk 19, Vektor Y3, AGS-17, and the HK GMG, which all fire at a higher velocity than related shoulder-fired grenades. They generally function as large-caliber machine guns with a relatively low rate of fire, used from an emplaced position or mounted on a vehicle or vessel in a similar way to a heavy machine gun.
- Comparison of automatic grenade launchers
- Hand mortar
- List of grenade launchers
- Recoilless rifle
- Rocket-propelled grenade
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