one powder discharge port 12 pointing upward and one powder discharge port 14 pointing downward the powder discharge port 12 is indented from the surface of the side wall by the depth of spray cone 13 shown in fig3 twist knob 18 provides for manual initiation of the smoke grenade bolt 19 attaches twist knob 18 to the grenade air aspirating ports 15 are also shown reference is made to fig2 bolt 19 attaches twist knob 18 through bayonet block 20 to mounting block 40 mounting block 40 has two bayonet sleeves 42 each sleeve provides for travel of a bayonet piston 46 in each sleeve is positioned a bayonet assembly including a bayonet piston 46 attached to a grooved metal bayonet 50 twist knob 18 is directly attached to bayonet block 20 and the two are manually rotated 10 u00b0 to 30 u00b0 on bolt 19 which is an axis of rotation bayonet block 20 includes ramps 25 in contact with bayonet pistons 46 the left ramp 25 is shown with bayonet piston 46 in front of it the right ramp 25 is shown in front of the bayonet piston 46 as bayonet block 20 is rotated bayonet piston 46 is forced up bayonet sleeve 46 for bayonet 50 to puncture the neck 68 of gas cartridge 70 two gas cartridges 70 are shown there could be one or more than two the limit is the desire for simplicity of construction and that the grenade be hand held in this embodiment.