Rock river arms is a leader in specialized modern sporting rifles.The rrage carbine builds on rock river arms' extruded flat top upper receiver.Made of 6061t aluminum, the receiver exhibits the clean lines and defined angles commonly associated with more expensive billet uppers while delivering comparable strength and precision dimensions.Its free-float handguard is constructed of 6061t aluminum and blends almost seamlessly with the upper to provide an elegant, unitized profile, balanced strength and rigidity across the optics platform.The carbine-length handguard also features a full-length ms1913 top rail and m-lok rail configuration for easy accessory adaptation.Other key components of the rrage include a lightweight chrome moly barrel, a2 flash suppressor, carbine-length gas system with a low-profile gas block, single-stage trigger, a2 grip, and the rra six-position tactical carbine buttstock.This model has a 16" barrel and a black finish.Metal Finish: BlackAction: Semi-AutoCaliber: 223 RemBarrel Length: 16"Capacity: 30+1Trigger: Single-StageSafety: ManualOal: 36"Weight: 5.75 lbsStock Description: 6 PositionMuzzle: A2 Flash HiderReceiver Material: 6061-T AluminumSights: None, Optic ReadyBarrel Description: Lightweight Chrome MolyTwist: 1:9"Barrel Length Range: 16" to 16.99"Weight Range: 5 lbs to 5.99 lbsHand: RightStock Finish Group: BlackMetal Finish Group: Blued/Black