M1 grenade adapter

It consisted of an add-on 22 mm (0.87 in) stabilizer tube and fins that converted a hand-grenade into a rifle grenade.

The user then removed the grenade's safety pin and braced the rifle from a standing or kneeling position.

The chemical grenade was inserted into the short prongs on the base disc; a spring-loaded metal collar (called a "set-back band") slid over the middle kept the arming lever from releasing.

The user then removed the grenades safety pin and braced the rifle from a standing or kneeling position.

The shock of firing causes the collar to slide off in flight, releasing the lever and arming the grenade.

(From left to right): M1 grenade adapter with Mk.2 fragmentation grenade, M22 smoke rifle grenade with impact fuze (unknown smoke color), M17 fragmentation rifle grenade with impact-fuze, M2 grenade adapter with AN/M8 smoke grenade (red)