S&T Daewoo K11

It consists of two separate weapons combined into a single unit: a lower assault rifle chambered to fire 5.56×45mm NATO rounds and an upper 20×30mm (caliber of shell x length of propellent case) grenade launcher firing both conventional and air-bursting "smart" grenades, along with its integrated digital sighting unit.

[5] 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.

[10] South Korea's state procurement agency, the Defense Acquisition Program Administration (DAPA) said it has fixed the defects by modifying the designs and improving the shooting control system and will resume its production.

[15] 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 airburst shell.

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.

[18] 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.

This will likely strengthen the ammunition power of the rifle make it easier to use, while also reducing the weight of the 6.1 kg (13 lb) weapon by 10 percent.