There is a 40m WP smoke/mark WP round. At least there was last time I shot an M79, about 1982.
Around 1979-'80 I worked on a development project for a series of small arms similar in intent to the *Liberator* pistol of WWII [and the Vietnam-era *Deer gun*] meant for arming a conquered or subject population to drain away vast numbers of occupation forces. Among the weapons we looked at were a very low cost and simplified suppressed 9mm SMG with but 7 moving parts [including the trigger mechanism!] a 2-shot over-and-under barrel configuration 40mm grenade launcher with a trigger mechanism formed from sheet metal stampings and the barrels and stock of nylon tubing, and other novelties. [Anti-tank duties were to be handled by the M72 LAW, not the greatest weapon of its type, but sufficiently useful that the Soviets copied it for use by their own folks.]
Among the ammunition meant for the little over-under blooper was a load using magnesium and fine aluminum powder, ignited and dispersed via a blackpowder and zirconium prop charge, that sufficed to both discourage close encounters and illuminate the area forward of the user at night. It also served as a neat incendiary: point the muzzle into a cracked door or broken window, and pull trigger.
Though not fielded, I'm reasonably certain that the end users of the things were meant to be the 10 million members of Lech Walesa's Solidarnosc movement of Poland. In August 1980 Walesa led the Gdansk shipyard strike which gave rise to a wave of strikes over much of the country, ended by the Gdansk Agreement, signed on 31st August, 1980, which gave Polish workers the right to strike and to organise their own independent union.
In 1981 General Wojciech Jaruzelski replaced Edward Gierek as leader of the Communist Party in Poland. In December 1981, Jaruzelski imposed martial law and Solidarnosc was declared an illegal organization. Soon afterwards Walesa and other trade union leaders were arrested and imprisoned.
By that time our designs had been finalized, limited test shot runs produced, and were but waiting for mass production. In '86 Gorbachev chose to back away from interference in Poland and the other Eastern European Soviet client states, and by 1989 Poland held parliamentary elections that emplaced a noncommunist government and in Solidarnosc again became a legal organization. But if it had gone the other way....
