Bushmaster's m4 patrolman's features a forged a4 flat top receiver constructed of 7075-t6 aluminum.It also has an a2 birdcage-style flash hider, mil-spec trigger and m4 style handguard.Action: Semi-AutoCaliber: 5.56x45mm NATOBarrel Length: 16"Capacity: 10+1Trigger: Mil-SpecSafety: Manual ThumbOal: 32.50"-36"Weight: 6.70 lbsStock Description: 6 Position CollapsibleMuzzle: A2 Flash HiderReceiver Material: 7075-T6 AluminumSights: A2 Front, Flip Up RearTwist: 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