The Stoner 63, is a 5.56x45mm NATO, Modular Weapon System, using a variety of modular components, it can be configured as a rifle, a carbine, a top-fed light machine gun, a belt-fed squad automatic weapon, or a vehicle mounted weapon. Also known as the M63, XM22, XM23, XM207 or the Mk 23 Mod 0 machine gun, it was designed by Eugene Stoner in the early 1960s. The Stoner 63 saw very limited combat use by United States forces during the Vietnam War, including the Navy SEALs and Marine Corps. The Council of Tomorrow acquired blueprints of the Stoner weapon system while it was still in development and continued to produce the Stoner 63 for its teams until the apocalypse.
The Stoner 63 can be reconfigured as a light machine gun, which can fire either from a disintegrating link belt or from a 100-round drum magazine. This changes the weapon's type to Light Machine Gun and increases the weapon's weight to 10.