The SIG GL 5040/5140 is a 40 mm grenade launcher, which can be mounted under all SIG SG 550/551 assault rifle models and is operated in single-shot mode.^[1] For compact SG 552/553, the smaller GL 5340 grenade launcher can be used.

•   Switzerland: The Swiss military in-service designation for the GL 5040 is 40 mm Gewehraufsatz 97.
•  Malaysia: Used by Malaysian Coast Guard.

• 40 mm Grenade Launcher GL 5040 and GL 5140 at Swiss Arms company website
• Swiss Arms GL 5040/5140 40 mm grenade launcher (Switzerland), Weapon accessories at Jane's
• Swiss Arms Law Enforcement and Defense Products Catalog