7.5″ 5.56mm 1:7 Twist 4150 Barrel in Rainbow PVD

• 5.56/.223 Chambered in 5.56×45

• Pistol Length Gas System

• .750 Gas Platform System

Rainbow PVD (Physical Vapor Deposition)

• Markings Spiral Engraved Near Break

• Black Nitride Coating

• Aesthetic Coating Which Improves Durability & Lubricity

• 4150 Chromoly Steel

• M4 Feed Ramps

• 1:7 Twist

• 1/2″ x 28 Thread

• Contour Profile