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It is not Sharon. - (Specifications and Features): - Ballistic Advantage Modern Series BABL556014M - 16" 5.56 M4 Carbine Length Barrel - 4150 Chrome Moly Vanadium AR15 Barrel - Chambered 5.56x45mm NATO accepts .223 Remington - Carbine Length Gas System - 0.750" Gas Block Diameter - M4 Barrel Extension - 1:7 Twist - Threaded 1/2x28 - HP and MPI Tested - QPQ Salt-Bath Nitride Treated - Black Finish.

sorry its just a .223/5.56 barrel(Specifications and Features): - Ballistic Advantage Modern Series BABL556014M - 16" 5.56 M4 Carbine Length Barrel - 4150 Chrome Moly Vanadium AR15 Barrel - Chambered 5.56x45mm NATO accepts .223 Remington - Carbine Length Gas System - 0.750" Gas Block Diameter - M4 Barrel Extension - 1:7 Twist - Threaded 1/2x28 - HP and MPI Tested - QPQ Salt-Bath Nitride Treated - Black Finish.

Hi Sharon, No it isn't. - SPECS - Ballistic Advantage Modern Series BABL556014M - 16" 5.56 M4 Carbine Length Barrel - 4150 Chrome Moly Vanadium AR15 Barrel - Chambered 5.56x45mm NATO accepts .223 Remington - Carbine Length Gas System - 0.750" Gas Block Diameter - M4 Barrel Extension - 1:7 Twist - Threaded 1/2x28 - HP and MPI Tested - QPQ Salt-Bath Nitride Treated - Black Finish.

sorry its just a .223/5.56 barrel(Specifications and Features): - Ballistic Advantage Modern Series BABL556014M - 16" 5.56 M4 Carbine Length Barrel - 4150 Chrome Moly Vanadium AR15 Barrel - Chambered 5.56x45mm NATO accepts .223 Remington - Carbine Length Gas System - 0.750" Gas Block Diameter - M4 Barrel Extension - 1:7 Twist - Threaded 1/2x28 - HP and MPI Tested - QPQ Salt-Bath Nitride Treated - Black Finish.