Pof p415 gen 4 has a 16.5" barrel and is chambered in 223 remington/5.56mm nato.It is crafted from 7075-t aircraft aluminum and features ambidextrous bolt catch magazine release bolt release and selector switch.This model has a black anodized finish and a 30+1 capacity.Metal Finish: Black Hardcoat AnodizedAction: Semi-AutoCaliber: 5.56x45mm NATOBarrel Length: 16.50"Capacity: 30+1Trigger: Single-StageSafety: ManualOal: 32.50"-36"Weight: 7.50 lbsStock Description: 6 Position MFTMuzzle: Triple PortReceiver Material: 7075 T6 AluminumSights: None Optic ReadyBarrel Description: NitridedTwist: 1:8"Barrel Length Range: 16" to 16.99"Weight Range: 7 lbs to 7.99 lbsHand: RightStock Finish Group: BlackMetal Finish Group: Blued/Black