The discharger consists of a hollow tubular spigot of about one inch diameter termi-nating in a part resembling the hilt of a bayonet. Over this spigot fits the hollow tail-piece of the grenade. It is fitted to the rifle, in the same manner as a bayonet, over the bayonet standard and foresight block, and is locked in position by a spring-loaded bolt. On firing the propelling cartridge, the gases pass out of the barrel of the rifle, through the spigot, and into the hollow tail piece to propel the grenade.

A swing over blade front sight is fitted to the left side of the base of the spigot.

A rear sight attachment is fitted to the left side of the rifle by means of a metal strap and thumbscrew. The body, which is movably attached to the metal strap by means of a carrier plate, is in the form of a metal box about five inches in length, on the forward end of which a V is formed. The other end, facing the firer when the sight is assembled to the rifle, is inscribed with a range scale graduated from 25 to 100 meters in steps of 25 meters. To give the desired range, the body is rotated and the appropriate graduation brought opposite a pointer on the carrier plate. The body is then held in position by a ball and spring detent.