The weapon consisted of an unrifled tube with a crude breech mounted on a Y-shaped pedestal which pivoted on trunnions to provide elevation. Two breech mounted inverted horns were provided for traverse/elevation and a simple inclinometer for targeting and range calculation. A black powder charge was inserted into the breech and fired by a percussion cap to propel the AZh-2 glass ampule. The ampules were filled with an incendiary mixture known as KS. KS was a mixture of 80% phosphorus and 20% sulfur which ignited when exposed to air. The burning mixture created a bright flame, thick white smoke and would burn for up to three minutes at temperatures between. The burning liquid would seep through vision slots or engine grilles on a tank and ignite ammunition or fuel as well as choke and blind the crew.