Mk 1 Illuminating Grenade

In outward appearance, the Mk 1 illuminating grenade resembles fragmentation hand grenades of the M26 series. The grenade body is made in two pieces; the illuminating charge is pressed into the lower half of the body and covered with a lever of firstfire composition, which is, in turn, covered with an igniter charge.

The fuse is an integral part of the grenade. The body contains a primer and quick-match bushing. Assembled to the body of the fuse are a striker, striker spring, safety lever, and safety pin with pull ring. The split end of the safety pin has an angular spread.

When thrown, the Mk 1 grenade ignites and splits in half, illuminating a Large Burst Template with bright light.