Tarkus was always a sure shot. He earned the nickname "Smoking Gun" after setting a record for the longest kill shot on Kozlov, the rain world. He's a fun guy, but get on his bad side and you won't live to regret it.
After a brief but tragic family related accident, the Smoking Gun spent years crafting his own rifle and bullets in the caves of Kozlov, living off the land. He forged himself anew and traveled to the Jemini Prime Relay to kick some ugly quesar ass in the name of revenge.
One can see Tarkus in a multitude of places; sharing stories in the local bars of the city of his conquests, on his home world Kozlov tending his ammunition plant or relaxing on the beautiful planet Crucible.