The M-29 81mm Mortar, is a smooth-bore, muzzle-loaded, high-angle, indirect fire weapon. It consists of a barrel, sight, bipod, and base plate. The M-29 has a greater range, and its circular base plate allows for firing in any direction. High Explosive (HE) Fragmentation and blast. Causes troop casualties and damage to light material. Red Phosphorus (RP), White Phosphorus (WP) Smoke. Used to screen, signal, and act as an incendiary. Illumination: Used to illuminate, signal, and mark.