The Weapon/Anti-Vehicle Model 6 Grindell/Galilean Nonlinear Rifle[1][2] (abbreviated W/AV M6 G/GNR), also known as the 141 Laser, is the UAOS's ground-based, man-portable, anti-vehicle, directed energy weapons. It is one of many known battery-powered allied weapons, is the most powerful infantry weapon fielded by Alliance forces. 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.

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