STK 40 GL
The STK 40 GL, formerly the CIS 40 GL is a 40 mm grenade launcher, developed in the late 1980s and produced by the Singaporean defense firm CIS - Chartered Industries of Singapore (currently ST Kinetics). The launcher is employed primarily by the Singapore Armed Forces and the police and security forces of several other countries. Design. According to ST Kinetics Senior Engineer Felix Tsai, the STK 40 GL can be configured to be used with a buttstock or attached underneath assault rifles like the SAR-21, the M16 and HK series.