(Fig. 4)

The grenade is fitte to a ride, by means of a spigot device, and fired with a 7.92 mm blank cartridge with wooden bullet.

The grenade consists of a streamlined bell-shaped body, with a slightly convex closing disc of aluminium, a graze fuze which screws into a  projection on the base of the body, and a vaned tail unit which screws on the base of the fuze and is closed by a rubber plug. The whole of the grenade is painted olive green and a 5 mm blue band is painted round the projection at the base of the body. The overall length is approximately 9.3 inches and the maximum diameter 2.4 inches.

The body is made of thin steel and is streamlined with a cylindrical projection about 0.4 inch long welded at the base. The projection is screwthreaded internally for the insertion of the fuze. A hole in the base of the body is fitted with an aluminium cup to accommo-date the protruding magazine of the fuze. The head of the body is closed by a concave disc of aluminium which is secured by the over-turned rim of the body.

The bursting charge consists of cast cyclonite/wax, bluish white in colour, with a hemis-pherical cavity of 0.79 inch radius in the head. The cavity is fitted with an aluminium liner of corresponding shape with a flange which fits inside the body at the head. The length of the body is 3.15 inches.

The fuze body is cylindrical with an external screw-thread at each end for assembly as the connecting piece between the tail unit and the body. A central recess contains the striker and crepp spring and is closed at its enlarged front end by an aluminium magazine which is screwed in and contains and an intermediary explosive. A transverse channel near the base contains a spring-loaded screwed shearing pin which engages in a recess in the stem of the striker. Another channel, containing a cutting pin with spring is bored from the base of the body and communicates with the shearing-pin channel at a point where the shearing pin is reduced in diameter. A circular plate, secured in a recess in the base of the body by two screws, retains the cutting pin in its channel. The base end of the cutting pin passes through a hole in the circular plate and is thus exposed to the pressure of the propellant gases.

Details of the magazine filling and the composition in the detonator are not available.

The tail unit screws on to the base of the fuze with a right-hand thread and consists of a drawn-steel tube with six vanes formed in pairs. The cartridge is placed inside the tube for transport and the tube is closed at the base by a rubber plug.

The cartridge is of the 7.92 mm small arm type with an undeyd hollow wooden bullet. The granular propellant consists of cylindrical grains 0.06 inch long and 0.02 inch in diameter with a basic composition of 54 per cent of P.E.T.N. and 31.4 per cent of nitrocellulose. Mineral jelly and graphite are also included.

The rubber plug is removed from the tail unit and with the cartridge loaded into the rifle in the normaly way the tube of the tail unit is placed over the spigot device at the muzz-le.

On firing the hollow wooden bullet is shattered by the propellant gases which project the grenade and, overcoming the spring of the cutting pin, drive the pin forward, casuing it to cut the shearing pin away from its screwed end. The shearing pin is them ejetted by the spring held in compression under its head, and thus leaves the striker held off the detonator only by the creep spring. On graze the momentum of the striker overcomes the creep spring and the detonator is pierced.