after being at rest two seconds after impact to leave no unexploded ordnance. One of the problems with the previous American Objective Individual Combat Weapon, which influenced the combination rifle/airburst launcher concept, was that its 20 mm grenade rounds were not very lethal. The fragments were often too small and light to be effective, there was not enough explosive material to create a large kill radius, and many fragments were dispersed vertically and away from the target. This was one of the reasons the OICW effort was cancelled, and it is not known if these deficiencies were addressed with the K11's airburst grenades of the same size. However, Daewoo solved this problem by increasing the height of the grenade, and a recent report indicated that the 20mm airburst grenade has more lethal fragments than a 40mm grenade. Furthermore, after the 2nd improvements, they developed a new technology which enabled the 20mm airburst grenade to explode in a single fixed direction to increase firepower, instead of exploding in all directions (which would reduce firepower). The K11 is being upgraded to reduce the shock generated in firing the 5.56 mm rounds by as much as 40 percent, and similar technology is under review to decrease the shock of launching 20 mm shells. This will likely strengthen the ammunition power of the rifle make it easier to use, while also reducing the weight of the weapon by 10 percent. In 2017, Daewoo revealed the 2nd gen K11 which improved the weight (5.5 kg) and the 20mm airburst grenade firepower. Users : Adopted by the Republic of Korea Armed Forces in 2010. See also XM29 OICW French Prototype PAPOP XM25 Individual Airburst Weapon System QTS-11 References External links S&T Daewoo Homepage Post–Cold War weapons of South Korea Firearms of Korea Daewoo assault rifles Bullpup firearms Grenade launchers Multiple-barrel firearms 5.56 mm assault rifles Weapons and ammunition introduced in 2010