It has a light sheet metal body, with an internal fragmentation coil, producing a limited but effective casualty radius (15 meters).
The grenade was changed and introduced to the Viet Nam war with a “Jungle Clip”. It is a secondary trigger on the grenade to prevent accidents.
During the Viet Nam War, many grenades caught onto trees and bushes and exploded, which is why the U.S. created the Jungle Clip. The user must press down on a part of the grenade and then pull the clip to trigger the grenade.
A major improvement from earlier grenades, the M61 is the first grenade which doesn’t spark or smoke when triggered.