The Ballistic Advantage Modern Series 5.56x45mm NATO Barrel (brand part number BABL556014M) is a 16-inch, M4 carbine-length barrel machined from 4150 Chrome Moly Vanadium steel and finished in a corrosion-resistant QPQ coating. Ballistic Advantage also QPQ-coats the M4 feed ramp extension for smoother, more reliable feeding under hard use. Built on a carbine-length gas system with a .750-inch gas block journal, it’s rifled at a 1:7 twist to stabilize the full range of common 5.56/.223 bullet weights. This is a solid, do-everything barrel for a duty, home defense, or range-focused AR-15 build.

Key Specifications

• Chambered in 5.56x45mm NATO.
• Measures 16 inches in length.
• Rifled at a 1:7 twist.
• Machined from 4150 Chrome Moly Vanadium steel.
• Finished in a corrosion-resistant QPQ coating.
• Features a QPQ-coated M4 feed ramp extension.
• Built on a carbine-length gas system.
• Gas block journal measures .750 inch.
• Cut in M4 carbine profile.

Frequently Asked Questions

What gas system does this barrel use? Carbine length.

What’s the twist rate? 1:7.

What gas block does it need? A .750-inch low-profile gas block, matching the .750-inch gas block journal.

Buy the Ballistic Advantage Modern Series M4 Carbine Barrel

Ballistic Advantage built the Modern Series for shooters who want proven 4150 CMV construction and a QPQ finish without paying for boutique branding. It’s a dependable, do-everything choice for a 16-inch AR-15 build. Shop more Ballistic Advantage parts or browse our full AR-15 barrels selection to complete your build. Order it from our Lubbock, Texas gun shop for fast, reliable shipping.