The STK 40 AGL, formerly the CIS 40 AGL[a] is a 40 mm automatic grenade launcher, developed in the late 1980s and produced by the Singaporean defence firm Chartered Industries of Singapore (CIS, now ST Kinetics).

[1] On 19 June 2000, STK announced the release of an upgrade kit, known as the 40mm Automatic Grenade Launcher Air-Bursting System (40mm AGL-ABS).

[2] Upgrades consist of the electronic fire control system, the gun computer, the muzzle programming coil as well as the optical sighting system.

[2] On 13 December 2010, the Kuwait Defense Ministry released a statement that the CIS 40 AGL was offered for the Kuwaiti military.

[4] The STK 40 AGL has a Mark II variant, which includes weight reduction of almost 6 kg; a barrel removal system; improved handling, performance, aesthetics and ergonomics.