This is the lightest carbine in the Bushmaster line, and features the Chrome Lined SuperLight 16" Barrel, which is turned from .670" to .565" diameter under the hand guard, .625" diameter under the sight base, and .570" diameter out to the muzzle. This slim profile barrel, with the Tele-style Stock, makes a sweet handling, easy to shoot carbine. Rifling is 1 turn in 9", right hand twist, six lands and grooves. A manganese phosphate finish is applied to the barrel as well as all other critical steel parts of the weapon for excellent protection against corrosion and rust. A3 Removable Carry Handle configuration. The M16A2 sight system, with dual flip-up aperture is designed for either short range shots at moving targets or long distance accuracy, and offers 1 Minute of Adjustment for elevation. Hand guards, butt stocks, and pistol grips on the Bushmaster Super Lights are molded of black thermoset polymer.