Original sentence: The rubble-filled packing case might be resting on top of an M5 or M142 firing device, connected to some blocks of TNT  or to some C4 explosive stuffed into the empty fuse pocket of a mortar shell
Edited sentence: The rubble-filled packing case might be resting on top of an M5 or M142 firing device, connected to some blocks of TNT  or to some C4 explosive stuffed into the empty fuze pocket of a mortar shell