The GES BioRifle continues to be one of the most controversial weapons in the Tournament. Loved by some, loathed by others, the BioRifle has long been the subject of debate over its usefulness. Some Tournament purists argue that the delayed detonation of the mutagenic sludge, coupled with the ability to quickly carpet an area with the highly toxic substance, has reduced the weapon to the equivalent of a minefield, a barbaric and cowardly weapon employed during past human conflicts. Proponents of the weapon argue that it enhances the tactical capabilities of defensive combatants, allowing participants to cover multiple choke points more efficiently. Despite the debate, the weapon remains historically accurate, providing rapid-fire wide-area coverage in primary firing mode, and a single-fire variable payload secondary firing mode. In layman's terms, this equates to being able to pepper an area with small globs of Biosludge, or launch one large glob at the target. -- Official description

The Biorifle is deadly, no matter how you use it. Whether it’s used as an offensive weapon or a defensive weapon, you can kill just about anybody, as long as you’re skilled with it, as you can hurt or kill yourself, too.

The primary button launches several small blobs of biosludge, which stick to the floor for a little bit and cause damage to anybody walking over them, yourself included, but not your teammates (unless friendly fire is enabled). This could be used defensively, especially in Capture the Flag games. You can lay down a circle of sludge around your flag, forcing enemies to run through it to grab the flag (they may jump, but most of the time they won’t notice it). This may not kill them, but it will certainly make it harder for them to get back to their base alive.

The alternate fire lets you charge up one great big gob of goop. The longer you hold the button, the more gob fills in the chamber, the more powerful it is. A fully loaded Biorifle can kill an enemy with full health if it lands directly on him. When using the Biorifle, it is best to keep the secondary fire constantly charged, so that it can be used against your enemy as soon as you see them.