Manufacturer: Royal Small Arms Factory
The ARWEN 37 is a non-lethal launcher which fires 37 mm non-lethal rounds (foam or wooden or tear gas payload) designed for riot control. It has a 5-round rotary drum magazine. “ARWEN” is an acronym for “Anti Riot Weapon ENfield”.
As of 2001, all ARWEN trademarks and patents are owned by Police Ordnance Company Inc. The weapon is manufactured under license in Canada.
(I’ve actually physically seen the police in Cambridge with this weapon so I’m not just adding it for the sake of adding it.)