Bushmaster's qrc pro (quick response carbine) features an a4 flat top receiver made from 7075-t6 forged aluminum.It also has a barrel with a2 birdcage-style flash hider, keymod mid-length handguard, bravo b5 6 position collapsible stock and b5 type 23 p-grip.Action: Semi-AutoCaliber: 5.56x45mm NATOBarrel Length: 16"Capacity: 10+1Trigger: Mil-SpecOal: 33"-36"Weight: 6.30 lbsStock Description: Bravo B5 6 Position CollapsibleMuzzle: A2 Flash HiderReceiver Material: 7075-T6 AluminumSights: None, Optic ReadyTwist: 1:8"Barrel Length Range: 16" to 16.99"Weight Range: 6 lbs to 6.99 lbsHand: RightStock Finish Group: BlackMetal Finish Group: Blued/Black