Abstract: A gun for dispensing viscous material, for example a mastic caulking material, and comprising a holder for a cartridge projecting from one edge of a generally plate-like stock in which a rod is mounted for movement longitudinally of itself, and a mechanism for advancing the rod longitudinally of itself to express material from the cartridge. The rod is mounted in the plate-like stock by being passed between bridge portions integral with the stock and deformed out of the general plane of the stock in opposite directions.