5.56x45mm NATO Barrels

Green Mountain 5.56 AR-15 Barrel 11.5" M4 A1 Phosphate

Green Mountain 5.56 AR-15 Barrel 10.5" M4 Phosphate

Green Mountain 5.56 AR-15 Barrel 10.3" M4 Phosphate

16" 5.56 NATO 1:8 Twist Black Nitride M4 Mid-Length Barrel

Ballistic Advantage 16" 5.56 1:7 Carbine Length Chrome/Phosphate Barrel

Aero Precision 5.56 Carbine M4 AR-15 Barrel - Pinned VG6 Epsilon SL - 14.5" (16" OAL)

Ballistic Advantage 11.5" 5.56 Hanson Carbine Cold Hammer Forged Barrel w/ .750 Low Pro Gas Block 1:7 Twist

NBS 4.5" 5.56 Nato Micro Pistol Medium 1:5 4150 Black Nitride AR-15 Barrel

NBS 10.3" 5.56 NATO 4150 CrMoV Carbine Government 1:7 Nitride Barrel

16" 5.56 NATO 1:9 Twist Phosphate Midlength Lightweight Barrel

20" 5.56 NATO 1:9 Twist Phosphate + Chrome-Lined Rifle Lightweight Barrel

16" 5.56 NATO 1:7 Twist Phosphate + Chrome-Lined Midlength Heavy Barrel

16" 5.56 NATO 1:9 Twist Phosphate + Chrome-Lined Midlength Heavy Barrel

16" 5.56 NATO 1:9 Twist Phosphate Midlength Heavy Barrel

16" 5.56 NATO 1:7 Twist Phosphate Carbine Heavy Barrel

16" 5.56 NATO 1:7 Twist Phosphate Midlength Lightweight Barrel

16" 5.56 NATO 1:9 Twist Phosphate Carbine Lightweight Barrel

16" 5.56 NATO 1:9 Twist Black Nitride Carbine Lightweight Barrel

16" 5.56 NATO 1:9 Twist Phosphate + Chrome-Lined Carbine M4 Barrel

16" 5.56 NATO 1:8 Twist Phosphate Carbine Government Barrel

20" 5.56 NATO 1:9 Twist Phosphate Rifle Lightweight Barrel

20" 5.56 NATO 1:9 Twist Phosphate Rifle Government Barrel

16" 5.56 NATO 1:9 Twist Phosphate Carbine Heavy Barrel

20" 5.56 NATO 1:9 Twist Phosphate + Chrome-Lined Rifle Heavy Barrel