S & T Daewoo K11 The S & T Daewoo K11 DAW ( Dual - barrel Air - burst Weapon ) is an assault rifle chambered to fire 5 . 56x45mm NATO rounds , as well as 20x30mm air - burst smart grenade from its overbarrel launcher . Two conventional 20 mm shells either detonate immediately on impact or on a timed fuse after impact . A third type of shell is controlled by the weapon ' s integrated electronics to explode a few meters from the target , yielding an air burst effect capable of killing targets within a 6 m area and seriously wounding those within a 8 m area . Users enter a range at which the shell is to detonate , allowing targets in ditches , in buildings , or behind walls to be destroyed without requiring the shell to strike the target . In May 2010 , the United Arab Emirates purchased a quantity of 40 K11s for evaluation purposes for a total cost of US $ 560 , 000 , giving an indicative unit cost of US $ 14 , 000 . History . The K11 was officially unveiled to the public at the DSEI military expo , though information pertaining to its development was available since 2006 . The weapon was adopted by the Republic of Korea Armed Forces in 2008 and was distributed within the Republic of Korea Army during 2010 , making it the world ' s first army to use an airburst rifle as standard issue in the military . Each squad is reported to be issued two K11s , though it will not replace grenadiers who currently use K2 rifles with the underslung K201 grenade launcher . In March 2011 it was announced that 15 out of 39 K11s issued since June 2010 ( including 7 out of 20 rifles used by Korean forces in Afghanistan ) had shown serious defects and the decision had been made to halt production and modify the design . The defects included : barrel movements during firing , defects in the striking mechanism , condensation forming inside the laser reception lens , and defects in switching from single to automatic fire . South Korea ' s state procurement agency , The Defense Acquisition Procurement Agency ( DAPA ) said it has fixed the defects by modifying the designs and improving the shooting control system and will resume its production . A total of 4 , 000 K11s will be produced with all to be fielded by 2014 . Design . Equipped with a laser range - finder as well as a ballistics computer , the K11 allows the operator to quickly find the distance to a target and launch an air burst shell . The shell will then detonate a few meters away from the target . An electronic scope is integrated on the K11 ; it can be linked to a goggle system with a digital display . The display can be used during nighttime with thermal imaging , and shows the range information from the laser range - finder . The weapon is compatible with standard 20 - or 30 - round 5 . 56 mm NATO magazines , and can hold 6 - round magazines of 20 mm shells at one time . The fire selector position and layout is similar to the M16 / M4 rifles ' selector , though some controls are different . It has four positions , three of which are : 9 o ' clock for safe ; 6 o ' clock for three - round burst for the rifle ; and 3 o ' clock for semiautomatic fire for the rifle . Spent shells are ejected from the right of the weapon from the 2 o ’ clock position of the shooter for left - handed operation . The fourth selector position is at 12 o ' clock and controls the grenade launcher , allowing bullets and grenades to be fired using the same trigger . Because of this they both cannot be available at the same time , although other rifle / grenade launcher combination weapons rarely need that capability . There are two types of 20 mm grenade rounds for the K11 , which are training and high - explosive . The training rounds are for practice and have no explosives . Explosive ammunition has an internal fuze with three selectable settings : point detonation , point detonation - delay , and airburst . The integrated weapon sight programs the airburst warheads after the laser rangefinder sights a target when the launcher is selected ( the sight automatically provides aiming points for bullets and grenades when their firing modes are selected ) . Point detonation explodes the shell on impact with a target and point detonation - delay lets the warhead penetrate a target before exploding ; penetration ability is unknown . The airburst setting detonates the grenade round in front of , over , or behind a target to hit troops in cover . If a round is not fired within two minutes of targeting information being programmed , it will disarm itself . If a grenade does not explode , a backup self - destruct safety mechanism automatically detonates it 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 .