The M7 Rifle Grenade, formally Rifle Grenade Launcher, M7 was a 22 mm rifle grenade launcher attachment for the M1 Garand rifle which saw widespread use throughout World War II and the Korean War. The M7 was a tube-shaped device, with one end slotting over the barrel of the rifle, the other end holding the grenade in place. Blank cartridges were loaded into the rifle prior to firing. When fired, the expanding gases generated by the cartridges propelled the grenade forward with considerable force. The M7 could fire grenades up to 350 metres (375 yards), compared the maximum of 30 metres (35 yards) achieved by hand grenades.