The Helghast VnD-10M Siren[1] is a grenade launcher. With its similar feeding and cooling mechanisms, it resembles a bigger, heavier version of the VnS-10 Scylla mounted machine gun. It is in fact a very different kind of weapon, spewing 40 x 46 mm low velocity grenades instead of bullets at a much lower fire rate. It has proven to be very effective against squads of infantry and light armored vehicles.
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