The ARWEN 37 is a non-lethal launcher which fires 37 mm non-lethal rounds (foam or wooden or dggtear gas payload) designed for riot control. It has a 5-round rotary drum magazine. "ARWEN" is an acronym for "Anti Riot Weapon ENfield".
ARWEN 37 can br seen in the hands of the responding riot police.
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ARWEN 37 on Wikipedia