Demo Charges are the general run of placed explosives beloved of terrorists and adventurers the world over. The usual variety can be detonated by radio signals, timers, or electrical charges, and inflict their damage on any objects within twenty meters, with an
Evasion saving throw for half damage. Victims within forty meters take half damage, with an Evasion save for none. The charge is sufficient to blow a four-meter wide hole in anything short of a reinforced wall. PCs with a background in demolitions or Fix-0 skill can shape the charge so it directs the blast in only one direction, sparing all but two meters of the rest.
When firing at TL4 military vehicles such as gravtanks, mechs, or starship armor, most TL3 Heavy weapons don’t count as Heavy for armor-penetrating purposes. Demo charges and explosives do, however.