The Kellerun assault rifle was a weapon employed by the Kellerun military. It fired rapid bursts of green plasma-like energy balls. They were used by the Kellerun assault team that boarded the T'Lani munitions cruiser where Nydrom, Julian Bashir, Miles O'Brien, and other scientists were working to dispose of the Harvester biogenic weapon. After fending off the attack, Bashir and O'Brien each took a rifle with them to the surface of T'Lani III where they hid out and waited for Starfleet to come looking for them. (DS9: "Armageddon Game")

This prop began as the Hunter's weapon from "Captive Pursuit" and later became the Jem'Hadar plasma rifle used in several episodes.