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Features:Length: 4" .40 S&W Caliber 1:16 Twist 5/8x24" Thread Pitch 4150 gun quality steel heat treated stress relieved. Black Nitride finish Chrome Moly Vanadium Made in the U.S.A. Fits: AR-40..

Features:Length: 8" .40 S&W Caliber 1:16 Twist 5/8x24" Thread Pitch 4150 gun quality steel heat treated stress relieved. Black Nitride finish Chrome Moly Vanadium Made in the U.S.A. Fits: AR-40..

Features:Length: 20"1:10 Twist.750" Gas Block DiameterRifle Length with A 0.125" Gas Hole Diameter5/8"X24 Thread Pitch4150 Gun Quality Steel, Heat Treated to RC 28-32 Hardness, Stress Relieved.Barrel Index Is Designed After The 1st Gen DPMS Pattern Also Known As LR-308..