The Gluon Gun is an experimental energy weapon featured in Half-Life.
The Gluon Gun fires a constant vortex of spiraling energy beams capable of destroying anything that it connects with in seconds. The beam deals massive damage with considerable radial damage at the point of impact and is highly accurate at long range. It is able to strike through bulletproof armor materials, completely bypassing their protection. The weapon's major drawback is its fast ammunition consumption. In appearance, the gun looks and acts like a fire hose which consists of a nozzle with several controls and a display panel affixed to it. This piece is attached to a thick hose that is then connected to a wearable backpack unit. It uses Depleted Uranium-235 for ammunition which it shares with the Tau Cannon and Displacer Cannon.
The Gluon Gun is the last weapon found in Half-Life. It is acquired in the chapter Lambda Core in the Test Firing Chamber at Hazardous Materials Bay B, right before Gordon Freeman enters the Lambda Reactor Coolant System. When the player enters the room, a scientist introduces himself as being part of the weapons research division and states that he is the creator of the gun. Unwilling to use it himself on living creatures, he allows Gordon to take the device. The accompanying firing chambers feature several Headcrabs and a Bullsquid that can be used as target practice. The second and only other Gluon Gun in the series is found by the Lambda Reactor in the supply depot belonging to the first Xen survey team.
 Behind the scenes
The Gluon Gun originally featured two firing modes, "wide" and "narrow", which the player could switch between by turning the handle at the base of the nozzle. In wide mode, the beam would do more damage but use more ammo, while narrow mode's beam would do less damage with no splash damage but consume less ammo. The final game only uses wide mode. In the game's initial release, the gun's beam color was pure blue and would leave a small cloud behind at the point of the beam's impact. This color was changed and the cloud effect removed in later updated versions.
Unused HEV Suit lines refer to Gluon Gun as an "experimental energy weapon." The weapon has its own unused ammo entity,
ammo_egonclip, which was to be called an "energy recharge unit" by the suit. This item lacks a unique model and uses the chain gun ammo box as a placeholder.
The Gluon Gun is available for use in the multiplayer portion of Opposing Force but does not appear in the singleplayer portion of the game or any of the other expansions. However, it can still be spawned using the console. There are indications the Gluon Gun was used during the development of Half-Life 2: Episode Three. Entities related to the weapon, including
item_ammo_uranium, can be seen in several leaked files.
The weapon's name refers to gluons, subatomic particles that bind quarks together. During the game's development, series writer Marc Laidlaw jokingly wished to the call the device the "Quantum Flux Cannon", abbreviated to QFC, because the team frequently ordered meals from the local Quality Food Centers supermarket. It is internally named the "Egon Gun" because of its resemblance and visually similar function to the proton pack, a weapon designed by the character Egon Spengler in the film Ghostbusters. "Egon" was also the nickname of one of the early scientist variants who resembled Spengler's counterpart from the animated television series The Real Ghostbusters.
 In other media
Early model in It's a Wonderful Half-Life.
 List of appearances
- Half-Life (First appearance)
- Half-Life: Opposing Force (Multiplayer only)
- Half-Life: Blue Shift (Game files only)
- Half-Life: Source
- Half-Life Deathmatch: Source (Non-canonical appearance)
- ↑ Half-Life SDK
- ↑ A screenshot demonstrating the original beam effect
- ↑ A screenshot demonstrating the updated beam effect
- ↑ Episode 3 and SOB FGDs leaked! on ValveLeakware (February 18, 2013) (archived)
- ↑ "During the making of HL1, so many meals came from the QFC supermarket that my original name for the Gluon Gun was the "Quantum Flux Cannon."" (October 7, 2013) @MarcLaidlaw on Twitter
- ↑ GB fans found at Valve Software on Proton Charging (January 10, 1999) (archived)
- ↑ Half-Life Alpha game data file (