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ANDERSON Barrel 5.56 M4 16" 1-in-8 Twist. AR-15 Barrel: 16" M4 Contour Barrel with 1:8 Twist, Chambered in 5.56/.223, Parkerized Finish. M4 Feed Ramps, Carbine Gas System. Length 16", Profile Contour, Twist 1-8, Finish Parkerized, Material 4150, Caliber 5.56/.223, Gas System Carbine, Gas Block System 0.7.
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