U.S. M31 practice rifle grenade post Korea - Vietnam

[dano1917]

The M31 replaced the M29 and was the last type used for the M1 Garand rifle. It continued to be used with the M14. The fuze is self arming when fired with piezoelectric initiator in nose, generates electrical impulse on impact pulsed through small wire to base at detonation. Penetrates 10inches of armour...Dano