The Mk. 2 "Pineapple" Bomb is an American made fragmentation grenade. It was the Long-Range weapon of Al Capone's gang.
Description
You can see the obvious resemblance to the fruit that gives its name
Frag radius: 50 feet
Explosive material: 2 oz of TNT
Outer material: cast iron
Weight: 21 oz
Uses
The American Pineapple Grenade originated in the first modern shrapnel grenade: the English 1915 Mills Bomb. 34 million Mills Bombs were used in WWI. The Mills Bomb would be used as late as the 1980s: especially since it could be used as a Rifle Grenade for additional range.
Developed in 1918, the Mk. 2 became the standard hand grenade of the US military in 1920 and saw service into the 1960's.
Some Pineapple Grenades could be fired from a rifle; becoming a Grenade Launcher. The grenade would be inserted into a cup shaped attachment. Then the explosive force of a blank round would propel it about 60 meters. These attachments are available for most modern assault rifle designs, but use customized rounds rather than the traditional grenade.