The di rifle features a free-float rail, nicorr treated barrel, a2 flash hider, a 6 position buffer tube, and a compact stock with quick detach sling mount.This optic-ready model features lwrci's design for ca-compliance.This detent prohibits the magazine from ejecting when the upper is on the lower.This means the only way to eject the magazine is to split the upper from the lower; making it ca legal.Metal Finish: Black AnodizedAction: Semi-AutoCaliber: 5.56x45mm NATOBarrel Length: 16.10"Capacity: 10+1Safety: Manual ThumbOal: 32"- 35.25"Weight: 6.60 lbsStock Description: 6 PositionMuzzle: A2 Flash HiderReceiver Material: SteelSights: None, Optic ReadyBarrel Description: Cold Hammer ForgedTwist: 1:7"Barrel Length Range: 16" to 16.99"Weight Range: 6 lbs to 6.99 lbsHand: RightStock Finish Group: BlackMetal Finish Group: Blued/Black