M6 Spartan Laser

The Weapon/Anti-Vehicle Model 6 Grindell/Galilean Nonlinear Rifle, (M6 G/GNR), more commonly known as the Spartan Laser, is a man-portable and vehicle-mounted directed energy anti-vehicle weapon used by the United Nations Space Command. It is one of the only known directed energy weapons fielded by UNSC forces, aside from the pulse lasers used by Office of Naval Intelligence prowlers and the X23 NNEMP Cannon used by Gremlin Combat Support Vehicles.

Background
The M6 G/GNR was developed as part of Project GUNGNIR, a program designed to provide supplementary matériel for the SPARTAN Program, hence the "SPARTAN Laser" moniker. The M6 G/GNR 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 three seconds before discharging the main laser. As the Spartan Laser charges, the charging tone gets noticeably louder and increases in pitch up until the laser is fired. The firing sequence can be aborted without discharging the battery as long as the weapon is not actually fired; for example, if the target moves out of sight or the operator needs to displace. 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 enters an approximately two-second-long standby sequence between shots while it cools.

The Spartan Laser is the most expensive small arm 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.

Vehicle-mounted variant
The largely obsolete AV-22 Sparrowhawk is equipped with a nose-mounted M6 G/GNR in addition to its twin-linked autocannons. This version of the Spartan Laser has similar firing and recharge rates to the man-portable version, though it has higher damage potential. Unlike the standard Spartan Laser, however, the version mounted on the AV-22 fires a bluish-white beam, which may suggest higher intensity; this is likely, as the Sparrowhawk can certainly carry a more powerful battery than the BA-53635/PLMD used by the standard version.

Targeting
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 reticule 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 reticule, whether on 1x or 3x magnifications, features a meter on the right side showing the charging status of the laser. The tick mark rests at the bottom of the circular shaped reticule while the laser is dormant, and gradually travels along the reticule's circumference until it reaches the point of origin, indicating that the laser is currently discharging.

Laser beam
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 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 exhaust vent. It is powerful enough to make its way through nine Warthogs parked bumper to bumper. It is also highly effective at destroying Scarabs' 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 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.

The version of the M6 G/GNR mounted on the AV-22 Sparrowhawk fires a bluish-white beam. The color of the beam suggests that it is fired at a higher intensity than the man-portable version, which is likely, as the mounted version has greater firepower.

Gameplay
"It's not overpowered, it's an elegant weapon from a more civilized age."

- Luke Smith

Advantages
The Spartan Laser is the most powerful small arm in Halo 3, Halo 3: ODST, and Halo: Reach, combining long range with lethal force. Most 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 easily strike and kill multiple opponents and vehicles if they are lined up correctly.

Disadvantages
As with all powerful weapons, there are a few disadvantages. The Spartan Laser needs to charge for three seconds, (four seconds after Title Update 2), before firing, and requires another two to four seconds to cool down after firing. In Halo 3 and Halo 3: ODST laser uses 20% of its battery's charge per shot, giving only five shots at most. In Halo: Reach, the weapon uses 25% of its battery power per shot, allowing a maximum of four shots.

The targeting laser may give 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. A point blank shot can cause fatal splash damage to the wielder.

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 or her opponent, lest the laser discharge in vain.

Halo 3 and Halo 3: ODST
The weapon is not available in the Halo 3 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 M6 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.

In Halo 3 Multiplayer, killing another player with the Spartan Laser awards the Laser Kill Medal. The achievement "Two for One" is unlocked by scoring a double kill with a single laser shot in any ranked free-for-all playlist.

In Halo 3: ODST, the weapon appears in the levels Uplift Reserve, Kizingo Boulevard, ONI Alpha Site, NMPD HQ, and Coastal Highway, usually in hands of Dutch, as well as in all Firefight maps. The weapon charges slightly faster than in Halo 3.

Changes from Halo 3 and Halo 3: ODST to Halo: Reach

 * The Spartan Laser has a slightly altered form factor, a darker color scheme, a different charging animation, and a thermal display attached to the side. The weapon depletes a quarter of the battery's charge per shot, meaning it only has four shots, decreased from five in Halo 3 and Halo 3: ODST.
 * The Spartan Laser has a longer forward grip, with less space between it and the trigger than in Halo 3, making it appear that there is not enough space for the forward grip to fold up when not in use.
 * When the weapon is charged, instead of one arrow moving down on the side of the reticule, two arrows move toward each other, meeting at the side of the reticule.
 * The charging time is now 2.5 seconds exactly.
 * The scope no longer zooms out instantly after each shot.
 * The beam can now be moved in a sweeping motion (albeit for a brief time), inflicting (reduced) damage to multiple targets.

Halo Wars

 * 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 Sparrowhawk is equipped with a chin-mounted Spartan Laser.

Campaign

 * On the level The Covenant on Halo 3, save the Spartan Laser given at the start of the level - or the spare reload lying nearby - for the Brute Chieftain in the Barrier Tower, as one/two hits (depending on the difficulty) should kill it. Hunters and the War Chieftain in the final tower are also good targets for the remaining charge.
 * During co-op in Halo: Reach level The Pillar of Autumn, it is advised to have one of the players to concentrate fire to destroy Phantoms with the Onager while the other player(s) destroy Banshees with the Spartan Lasers, as Phantoms are difficult to eliminate with the laser.

Multiplayer

 * When coming upon a laser pick it up and get to a good/safe spot that vehicles go by often so you can get many vehicle kills.

Trivia

 * As a reference to its development program, 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. The word "Galilean" is also printed on the side of the weapon.
 * The Spartan Laser's beam 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 when fired at a 45 degree angle.
 * It remains unclear what kind of mechanism the M6 uses to create its laser beam. Some have suggested that it uses a chemical laser; however, a gas or chemical laser does not produce a powerful energy output, and also require large amounts of highly volatile and toxic chemicals to function, which are expended as the weapon fires. The weapon seems to be only powered by a rechargeable battery pack, hinting that it may be a Solid-State Laser or Free Electron Laser, which does not require a constant source of a chemical gain medium.
 * 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.
 * In The Package, the Spartan Laser is shown to be able to deflect an energy sword and is, in that instance, dual wielded with an SMG.
 * 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 has only expended 10% of its power with each shot. However, in Halo 3 and Halo 3: ODST and Halo: Reach, the Spartan Laser uses 20% and 25% of its battery with each shot respectively.
 * When the player picks up a Spartan Laser that has a battery percentage that does not divide by 20 evenly, he will be able to fire a 20% powered laser and another shot after that with the remaining charge.
 * As with all battery weapons, a weapon with low power that is dropped on the ground when its AI operator is killed will be assigned a random power level between 60% and 70%.
 * Oddly, the Spartan Laser's barrel cover can be seen opening up when the player switches to it, even though it is already open on the player's back.
 * Early concept art of the Halo: Reach starfighter YSS-1000 Sabre includes the Spartan Laser, which was most likely replaced by the Medusa missiles.

List of appearances

 * Halo 3
 * Halo Wars
 * Halo: Helljumper
 * Halo 3: ODST
 * Halo Legends
 * The Package
 * Halo: Reach