The super duty rifle features the latest in weapon technology.The rifle features a nanoweapon coated surefire closed-tine warcomp mounted to a 16" mag phosphated cold hammer forge, chrome lined geissele barrel.The geissele length gas system and geissele super compact gas block (with bomb-proof installation) ensures reliability and optimal performance in extreme conditions and heavy use.Exclusive to the super duty 16" rifle is the brand new ssa-e x with lightning bow trigger.The nanocoated, two-stage trigger features a wide body and bow shape that finds the perfect balance between a classic m4 trigger and a flat body trigger.The bcg is machined from mil-spec 8620 steel, with a properly torqued and staked, chrome lined gas key.The super duty lower is precision machined from 7075-t6 aluminum and features geissele's ultra duty lower parts kit featuring our ambidextrous super configurable safety and ultra precision trigger guard.A high quality mil-spec geissele buffer tube with a super-42 in h2 buffer ensures this rifle is properly tuned out of the box.The 15 mk16 super modular rail, that mates to the super duty upper receiver via a center aligning tab that removes any chance of rail rotation.Action: Semi-AutoCaliber: 5.56x45mm NATOBarrel Length: 16"Capacity: No MagazineTrigger: SSA-E w/Lightning BowSafety: AmbidextrousStock Description: B5 Enhanced SopmodMuzzle: SureFire WarcompReceiver Material: AluminumSights: None, Optic ReadyBarrel Description: Cold Hammer Forged, Chrome Lined Geissele ProfileTwist: 1:7"Barrel Length Range: 16" to 16.99"Hand: RightStock Finish Group: BrownMetal Finish Group: Brown