We found one dictionary that defines the word rifle-mounted grenade launcher:

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1. Rifle-mounted Grenade Launcher: Encyclopedia

▸ Words similar to rifle-mounted grenade launcher ▸ Usage examples for rifle-mounted grenade launcher ▸ Idioms related to rifle-mounted grenade launcher ▸ Wikipedia articles (New!) ▸ Words that often appear near rifle-mounted grenade launcher ▸ Rhymes of rifle-mounted grenade launcher ▸ Invented words related to rifle-mounted grenade launcher