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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 WWI 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 supplanted in the infantry fire support role by a combination of grenade launchers (typically affixed to rifles) and disposable anti-armor rockets. After the introduction of the new Heckler & Koch G-3 rifle as the standard assault rifle of the Bundeswehr in 1959, the German company Diehl from Nuremburg began the development work on a fin-stabilized anti-tank rifle grenade successor for the Belgian-made Energa rifle grenade. The first live-firing tests of the Hispano grenade were carried out in 1964. Instead of using a usual impact fuse, new paths were gone. The grenade body consists of two metal contact jackets (Kontakt hauben) one above the other. On impact, the outer jacket will be dented until touching the inner jacket, thus closing an electric circuit and setting off the grenade. When introduced in the Bundeswehr, the grenade was named GGR DM-22 HEAT (“DM” means Deutsches Modell) and the training grenade UBGGR DM-28 UB. Sometimes training grenades were modified by armorers to EX-grenades by drilling holes in the rubber body and painting them green (these grenades were only used for preliminary practicing).