Gunman TC — Total Conversion Mod for Quake 2, by Valve Software

"As a bounty hunter making a living on the harsh worlds of the Frontier, you find yourself hired by one of the Big Five, Spiral Dreams. As one of the movers and shakers of the Northern Freedom Confederacy, they've asked you to do a little job and keep it quiet. You would wonder why they'd ask for a hush-hush operation on some forsaken Frontier world dotted with poor colonists, but you're not a Gunman because you ask questions. The pay is good, the connections're better. Let's just hope Spiral Dreams keeps your name high on their lists."