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The Mk 1 Grenade is a Fragmentation Hand Grenade used by the Americans during World War I. According to its designers, it was to be the "simplest", yet most "fool-proof" grenade ever made. It was retired from service before the war ended after seeing some major problems.

Mk 1A1 Practice Grenade

The Mk 1A1 Practice Grenade is a practice grenade that mimics the Mk 1 and Mk 2 fragmentation grenades.