The FN FCU Mk3 can be fitted onto any rifles or carbines - such as the FN MK 16 or MK 17 carbines featuring an rail-mounted grenade launcher, onto stand-alone launchers such as FN40GL-S (FN MK13 ...

The M203 and M320 mentioned here are both single-shot 40x46mm grenade launchers, which the Army primarily fields as under-barrel attachments for existing M16/M4-series guns. The M320 can also be ...