Windham weaponry's src (sight ready carbine) features a chrome-lined 16" 4150 chrome moly vanadium steel barrel with m4 feed ramps.The 7075 t6 aircraft aluminum receiver sports a durable black hardcoat anodized finish.The rifle features an aluminum trigger guard, m4 double heat shield handguards and is optic ready.This rifle is available with magpul moe furniture in multiple finishes.Metal Finish: BlackAction: Semi-AutoCaliber: 223 RemBarrel Length: 16"Capacity: 30+1Trigger: StandardSafety: LeverOal: 32.38"-36.13"Weight: 6.30 lbsStock Description: 6 PositionMuzzle: A2 Flash HiderReceiver Material: 7075 T6 AluminumSights: None, Optic ReadyBarrel Description: 4150 Chrome Moly Vanadium M4 ProfileTwist: 1:9"Barrel Length Range: 16" to 16.99"Weight Range: 6 lbs to 6.99 lbsHand: RightStock Finish Group: BlackMetal Finish Group: Blued/Black