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- “It's not overpowered, it's an elegant weapon from a more civilized age.”
The Weapon/Anti-Vehicle Model 6 Grindell/Galilean Nonlinear Rifle (abbreviated W/AV M6 G/GNR), also known as the Spartan Laser, is the UNSC's ground-based, man-portable, anti-vehicle, directed energy weapon.
It is one of two known battery-powered UNSC weapons, the other being the Model 99 Special Application Scoped Rifle (used by Sgt. A. Johnson during Operation: KALEIDOSCOPE) and is the most powerful infantry weapon fielded by UNSC forces, even overpowering the Rocket Launcher (Except in Halo: Reach). It is capable of penetrating multiple targets, including tanks, unlike the Sniper Rifle, which can only penetrate infantry. It is alternatively known as the Galilean, or, in player lexicon, the "Splaser". The "Spartan Laser" nickname originates from the fact that it was designed in parallel with the Mjolnir Powered Assault Armor/[G] variant.
The M6 Spartan Laser is a man-portable, shoulder-fired, directed energy weapon used by the UNSC. When the trigger is pulled, a red targeting laser is painted on-target accompanied by an audible whine as the weapon cycles up. The Spartan Laser will then charge for approximately two to three seconds before discharging the main laser. As the Spartan Laser charges, the charging tone gets noticeably louder and increases in pitch until the laser is fired. If the target moves out of sight or the operator needs to relocate, the firing sequence can be aborted without discharging the battery as long as the trigger is released before the weapon actually fires. The laser is capable of penetrating several enemies or vehicles, and has a small blast radius, injuring targets within two meters of the point of impact and toppling light vehicles. It has an offline sequence between shots while it (presumably) cools down (approximately 2–4 seconds), and is highly effective at destroying enemy vehicles.
In Halo 3 Multiplayer, if you kill another player with the Spartan Laser, you will receive the Laser Kill medal. It is likely awarded due to the difficulty of having to charge and aim the weapon. Also, the achievement "Two for One" is unlocked by scoring a double kill with a single laser shot in any ranked free-for-all playlist.
The weapon is not available in the campaign until the level The Covenant, in which John-117 begins the level armed with the Spartan Laser. There is another Spartan Laser lying nearby on the ground near the Pelican, presumably dropped by a Marine when it was shot down. The Spartan Laser is the only weapon able to harm 343 Guilty Spark on the final level of Halo 3, with the exception of the Fuel Rod Gun and Rocket Launcher, through a glitch that Bungie has removed.
The Spartan Laser is the most powerful weapon in Halo 3, combining long range with a lethal, sudden force. The weapon is classified as an anti-infantry and anti-vehicle weapon, making it a weapon that can destroy almost anything in the operator's path. All destructible vehicles are often destroyed in a single blast, except in the case of a near miss, in which case the target will still suffer heavy damage. It can also strike and kill multiple opponents and vehicles if they are lined up correctly. It is more powerful than the rocket launcher, and since the main beam travels instantly, it can be used far more easily and reliably at range.
As with all powerful weapons, there are a few disadvantages. The Spartan Laser needs to charge for three seconds (four seconds after TU2) before firing, and requires another two to four seconds to cool down after firing. The laser depletes 20% (25% in Halo: Reach and Halo 4) of its battery's charge per shot, giving it only five shots (Four in Halo: Reach and Halo 4) at most.
Also, the targeting laser gives away the operator's position. If a player sees the targeting beam, they could possibly dodge the shot, thus wasting valuable battery power, though this is very unlikely, as the targeting beam is very faint and hard to see in the midst of battle. However, it is possible to hear the laser if you are near the operator, and can thus enact a countermeasure to prevent the operator from striking.
In addition, a point blank shot is not recommended, as you can commit suicide through splash damage, in addition to the aiming skills required to perform such a maneuver.
Finally, the laser is infamous for the difficulty in aiming the weapon, being nearly impossible for inexperienced players to engage quick, erratically-moving targets. This is caused by the charging time, which mandates that the player keep an accurate lock on his opponent, lest the laser discharge in vain.
When the weapon is equipped, a shroud over the emitting lens of the laser lifts up to expose it, presumably to protect it from scratches and battle damage when holstered, although the weapon is shown with the shroud up when it is on a person's back. The shroud can be seen releasing from its protective state when the weapon is drawn in first person view. A small hydraulic or pneumatic cylinder on the left side of the shroud actuates the shroud where it is anchored to the chassis of the weapon. When the trigger is pulled, a harmless red laser sight is projected on the target and a unique targeting tone is emitted which slowly becomes louder. The Spartan Laser will then charge for four seconds before firing a red laser beam that usually destroys the target. In the Halo 3 beta, if the reticle was moved while firing, a scattering of beams would be released, spreading over the targeted area. For the few frames while the laser is fired, the right targeting stick is disabled. The beam can be strafed, however, over a larger area if the player is moving while the laser is firing.
The Spartan Laser is equipped with a smart-linked Wyrd III optics suite for increased accuracy and is capable of 3x magnification. Its reticle, whether on 1x or 3x magnifications, features a meter on the right side (left side in Halo: Reach and Halo 4) showing the charging status of the laser. The tick mark rests at the bottom of the circular shaped reticle while the laser is dormant, and gradually travels along the reticle's circumference until it reaches the point of origin, indicating that the laser is currently discharging.
Contrary to popular belief, the Spartan Laser is not a one-hit, one-kill weapon. In gameplay, damage is inflicted on a target by means of multiple, precision strikes from the laser. Instead of what appears to be one intense, uninterrupted beam of energy, the laser is actually multiple, but smaller, charges of energy, sent downrange in rapid succession, giving the appearance of a continuous beam. As the laser is light, there is little chance for escape or evasion before imminent doom. However, it is possible to avoid complete annihilation by traveling at high speeds or quickly finding some cover, thus avoiding the rest of the devastating beam. Once the main laser is discharged downrange, the target receives the intense increase in energy as thermal energy, which then proceeds to impart physical changes upon the target. With each passing millisecond the target is hit by the main laser, the energy levels rise until they become intolerable and result in combustion (in the case of vehicles) or death.
Under normal circumstances, as long as a direct impact is delivered, one laser shot will destroy any target. Wraiths and Scorpions cannot simply be fired upon at any location; each has a vulnerable point that must be hit in order to achieve a catastrophic kill with one shot. The Wraith must be fired upon from the vehicle's rear, right below the mortar at its power core, or directly aimed at the cockpit. The Scorpion must be hit in the driver's canopy to kill him or her instantly, though to destroy the tank you must aim for the cannon. It is powerful enough to penetrate the armor of nine Warthogs. It is also highly effective at destroying Scarab leg joints, although The Covenant is the only mission where this can be done, and it is unlikely the player will keep the Spartan Laser that long into the level without completely draining its battery.
The intense energy of the beam imparts splash damage up to a range of approximately two meters from the impact point. A careless operator that discharges the laser while too close to any obstacle will instantly be killed. The beam can also penetrate multiple obstacles and/or targets, provided they are aligned along a linear trajectory.
It is powered by a BA-53635/PLMD non-replaceable battery, which is recharged with a PP-16979/AM-Sh charger. UNSC logistics, however, are not sufficient for the charger to accompany many W/AV M6 G/GNR units in the field. It would be better to use the weapon when hidden as it takes a long time to charge and the enemy has a better chance of defending themselves, unless the wielder remains concealed from their enemy.
It is possible that the amount of energy used to fire a shot can be adjusted to change the amount of damage dealt. In Halo: Reach the laser uses 25% of the battery with each shot. In Halo 3 and Halo 3: ODST the weapon uses 20% of the battery, in The Package it uses 10%, and on the final level of Halo 3, Johnson's Laser can be fired multiple times before the player equips it. After it is equipped the HUD reads that it still has 86% of the battery left. While in Halo: Reach and Halo 3 most battles are on a larger scale with heavy, shielded infantry and enemy vehicles, the Package and Halo consist of battles that either take place in close quarters or against smaller, individual targets. It is possible that the respective users (Fred and Johnson) changed the settings to fire lower-powered bursts that use less charge.
- This is the most powerful weapon in any of the Halo games after the Scarab Gun from Halo 2 and Rocket Launcher in Halo: Reach.
- Luke Smith's comment: "It's not overpowered, it's an elegant weapon from a more civilized age," is a reference to Star Wars' lightsabers, described as such by Obi-Wan Kenobi.
- The Spartan Laser is currently the most expensive hand held weapon known to be produced by the UNSC. It costs 218,000.00 cR, more than the cost of four fully armed Warthogs, 134 MA5B Assault rifles, or over 7,266 M9 Fragmentation Grenades.
- In The Package, the Spartan Laser is shown to be able to deflect an Energy Sword and is, in that one instance, dual wielded with a single SMG.
- One direct shot will disable most vehicles and individuals. The known exceptions are large targets, such as Phantoms and Hunters.
- In The Package, after Frederic-104 fires his Spartan Laser twice, his HUD shows its battery has 80% of its power left, meaning his Spartan Laser only lost 10% of its power with each shot, yet in Halo 3, Halo: Reach, and Halo 4, the Spartan Lasers use up 20% in Halo 3, and 25% and in Reach and Halo 4 with each shot respectively.
- In Halo 3, the charge used from the Spartan Laser takes up 20%, while in Halo: Reach it takes up 25%. This might be because Halo 3 takes place much later than in Halo: Reach, which means that the Spartan Laser that takes up 20% is a newer, more energy efficient version than the one in Halo: Reach, which takes up 5% more energy with each shot. This may not be true as the Halo 4 Spartan Laser has only 4 shots, but the Spartan Laser seems to be a little stronger, so it is possible that the increased damage reduces its battery more.
- Although the laser can go through vehicles and infantry, it cannot go through walls. However, this was not the case in The Package, where it was shown to be able to cause the doors of a Covenant ship to explode after melting a little.
- On Legendary difficulties, the Spartan Laser cannot kill a Hunter in one hit.
- The Spartan Laser's shape has a slight resemblance to the real world FN P90 submachine gun.
- This weapon can have 400 units of charge in Halo: Spartan Assault.
- The side of the weapon has the Norse symbol for "Gungnir" etched into it, which was the mythical spear wielded by the god Odin in Norse Mythology. Gungnir was described as having the ability to always hit its mark. Part of the mythology is that Odin would hurl his spear over the doomed side of a battle. This also adds to the theory of how the Spartan Laser was named because the Spartan armor is called MJOLNIR, Thor's hammer. It is likely that Project GUNGNIR mentioned in the ONI Memorial in the ONI Alpha Site is, in fact, the name of the development project for the G/GNR.
- The Spartan Laser seems to trail off forever when fired into the sky, very much like the Sentinel Beam. The beam of both weapons does end, however, usually at the invisible walls of the playing area. The Laser beam on Sandtrap covers over 75% of the width of the area (fired at a 45 degree angle).
- When you pick up a Spartan Laser that has a battery percentage that does not divide by 20 evenly you will be able to fire a 20% consuming laser blast and another shot after that with the remaining charge. For example, if you have 21% power left in your Spartan Laser, you can fire up to 2 shots, including the 1% amount of power. The damage is still equal to the 20%.
- As with all battery weapons, a weapon with low power dropped on the ground when its AI operator is killed will be assigned a seemingly random power level between 60% and 70%.
- The weapon itself reads "Galilean" above the trigger.
- When Marines are given a Spartan Laser in campaign, they will do the animation for reloading a rocket launcher before they fire.
- There is a glitch in Halo 3 on the level Halo; if you should kill Sergeant Johnson, his Spartan Laser will have infinite battery life.
- In the campaign, Jerome-092 and two of the members of Team Omega are armed with Spartan Lasers.
- In skirmish and multiplayer, the Spartan Laser is the final upgrade available to SPARTANs.
- The AV-22 Sparrowhawk is equipped with a chin-mounted Gauss cannon which has been mistaken as a new type of laser because of its color.
- Spartans hold the Spartan Laser with both hands on the front grip.
- According to the official Halo: Reach guide, the Spartan Laser is the second most powerful weapon in Halo: Reach. The Rocket Launcher (M41 Surface-to-Surface Rocket Medium Anti-Vehicle/Assault Weapon) is a "hair" stronger.
- In the Halo: Reach Beta, the Spartan Laser had a very rare but annoying "misfire" glitch. This would cause the Laser to kill the player wielding it instead of firing. However, this glitch was fixed in the full game.
- The pop out screen has a very faint GUNGNIR symbol, the most visible part being the cross.
- In firefight if the player is using John-117's voice, he will call this weapon the "Master Chief Laser".
- With a little aiming and luck, it is possible to shoot off the main cannon of the Wraith or Scorpion tanks, making them unable to fire. With another shot or two the tank will be destroyed.
- One hit from the Laser on a Scorpion's tread will instantly destroy the tank, deeming this weapon able to destroy any Multiplayer vehicle in the game with only one shot.
- The Wraith's back exhaust port is very vulnerable, and can also destroy the tank from a well-placed laser hit.
- In the Halo 4 campaign, the Spartan Laser only appears in the level Composer.
- In Halo 4, the Spartan Laser has '2401' written on the side of it, a possible 7 reference, as 74=2401, and 2+4+0+1=7
- The Ammo armor modification grants 50% more battery which allows for 6 shots in total.
- A vehicle variant of the Spartan Laser, the M8C Grindell/Galilean Nonlinear Cannon, is mounted on the gunship variant of the D79H-TC Pelican.
- There is a glitch called the "Rapid Fire Spartan Laser" in which the Spartan Laser fires like a pistol. The tutorial can be found here.
- The Halo 4 M6 G/GNLR has a sticker on its sides and front reading "Big, Scary Laser. Do not look into beam with remaining eye."
- In Halo 4, a warning sticker towards the back of the gun indicates that the Spartan Laser has a wavelength of 343 nanometers, an obvious reference to 343 Industries. In reality, a 343 nm wavelength laser would be invisible to humans as it lies outside of the visible spectrum (400-700 nm). The laser is obviously larger due to the visibility of the laser.
- When switching to the Spartan Laser in the passenger seat of a Warthog, the Rocket Launcher sound effects are heard rather than the Lasers.
- "I got to use the Spartan Laser once. Heh. I bet there ain't a thing in the galaxy that it wouldn't cut right through." 
- Halo 3 (First appearance)
- Halo Wars
- Halo: Helljumper
- Halo 3: ODST
- Halo Legends
- Halo: Reach
- Halo 4
- Halo: Spartan Assault