The Mk 2 grenade is a fragmentation hand grenade used by the US armed forces during World War II and in r conflicts including the Vietnam War. It was phased out gradually and generally replaced by the M67 and M61 grenades. The Mk 2 was commonly known as a "pineapple" grenade, because of its distinctive shape. A common misconception is that the grooves aided fragmentation of the grenade; however, they were cast into the iron shell in order to aid in gripping the grenade. The filling is either TNT; approx. 2 ounces, or EC (smokeless firearm) blank fire powder; approx.

Inert - US Mk2 Pineapple Grenade