depending on the groove at which the grenade is placed.
a. A grenade launcher (fig. 6-5) functions as an extension of the rifle barrel. It is attached to the muzzle by a clip latch fitted over the bayonet stud of the rifle. A hollow stabilizer tube on the grenade fits over the barrel of the launcher and is secured by a clip retainer spring. (Some newer model springs are designed to hold the grenade in position in the rifle barrel without requiring a separate launcher.) Numbered annular grooves on the barrel of the launcher provide variations in range, b. A launcher positioning clip is used to aid in uniform and rapid positioning of multiple grenades fired from the same position on the launcher. The clip is a 5/16-inch, steel strip bent to fit around the launcher. It may be moved to different numbered positions on the launcher to facilitate rapid fire.
c. Grenade cartridges (fig. 6-6) are specially designed blanks which generate a large volume of high pressure gas. When the grenade cartridge is fired, this gas provides the thrust necessary to propel the rifle grenade from the launcher to the target.
A 5-point, rose-petal crimp on the wad end of the cartridge distinguishes grenade cartridges from other blank rifle cartridges. (The two types not interchangeable.)
d. Grenade projection adapters (fig. 6-7) are used to convert high-explosive and chemical hand grenades to rifle grenades. A typical adapter consists of a stabilizer fin assembly. Three springsteel claws on the stabilizer grip the grenade body. A frangible arming clip is assembled to one claw. When the grenade is placed in the adapter, the safety lever of the grenade is inserted in the arming clip to hold the lever in place until the grenade is fired. (The safety pin is removed prior to firing.) On firing, the arming clip moves to the rear, breaking free from the adapter. This releases the grenade lever, which initiates the fuze.
6-5. Types Rifle grenades are classified according to use as service (fragmentation, high-explosive antitank and chemical) and practice. Types designed exclusively for projection by rifle are the high-explosive antitank, practice and smoke rifle grenades.
a. The high-explosive antitank grenade (fig. 6-8) which is used against tanks and armored vehicles, consists of a fuze, a body assembly, an adapter, a stabilizer tube and a fin assembly. The body contains about 12 ounces of high explosive shaped around a copper cone. The fuze is an electric, point-initiating, base-detonating type. A piezo-electric element in the nose of the grenade provides the power source for the fuze. On impact, the piezoelectric element generates and electric current which initiates the explosive train in the fuze. The main charge is detonated by a booster. Detonation of the charge creates a jet of hot gas and metal particles which penetrate the target.
b. Smoke rifle grenades are designed primarily for producing smoke: either for signaling or screening purposes. One type of smoke grenade, the white phosphorus (WP) grenade, also has incendiary capabilities. It may be used to ignite flammable targets or inflict injury on personnel. There are three basic types of smoke rifle grenades: the WP smoke grenade, the colored smoke grenade, and the colored smoke streamer grenade. The WP smoke grenade functions on impact, bursting the body and scattering particles of burning white phosphorus over a large area. The colored smoke grenade functions on impact, emitting a cloud of colored smoke for approximately one minute. The colored smoke streamer grenade functions on firing, emitting a stream of colored smoke as a trail during its trajectory.
c. Practice rifle grenades are designed for training personnel in care, handling and use of rifle grenades prior to training with live or service grenades. This type of grenade is completely inert (no filler or fuze). It may be fired to the target with only minimal effect on the practice target used.
d. Certain fragmentation, chemical and practice grenades can be changed to rifle grenades by fitting standard model hand grenades with projection adapters (fig. 6-7). Colored smoke and WP grenades, adapted for rifle projection, are illustrated in figures 6-9 and 6-10.
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