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The Ballistic Advantage Modern Series 13.9-inch Government Profile barrel is built for AR folks who want a shorter, handier rifle without giving up the manners of a mid-length gas system. That slightly-under-14-inch length trims weight up front and makes the gun quicker to swing around, which is exactly why this platform has gotten so popular for pin-and-weld builds that land right at 16 inches once a muzzle device gets permanently attached.
This one is machined from 4150 Chrome Moly Vanadium steel and treated with a QPQ corrosion-resistant finish inside and out, so it shrugs off rust and hard use. The chamber gets a QPQ-coated M4 feed ramp extension too, which keeps feeding smooth and reliable no matter what you're running through it. The government profile keeps things thicker under the gas block where heat builds up, giving you a nice middle ground between a heavy bull barrel and a whippy pencil profile.
The mid-length gas system is the real story here. That longer distance between the chamber and the gas port means more dwell time, which translates to softer felt recoil, less violent bolt carrier movement, and more consistent cycling than you'd get from a carbine-length setup at this barrel length. Folks who've built on these barrels regularly report smooth running with both .223 and 5.56 across a range of ammo, with plenty of guys stacking up multiple BA barrels in their safes because they've had good luck with them.
The 1:7 twist rate stabilizes heavier projectiles beautifully, so 62-grain and 77-grain loads are right in its wheelhouse while still doing fine with lighter stuff. It wears a standard .750 gas block journal and a 1/2×28 threaded muzzle, so mounting your favorite flash hider, brake, or suppressor is straightforward. Pair it with a mid-length gas tube and a matching gas block and you've got the foundation for a build that punches above its size. Made in the USA.
A 13.9-inch barrel gives you a shorter, lighter, more maneuverable rifle up front while still running a mid-length gas system. Many builders permanently attach a muzzle device to bring the overall length to 16 inches, which keeps the balance and handling of a shorter gun. It's a popular route for anyone who wants a compact feel without going the SBR direction.
It uses a standard .750-inch gas block journal, which is the most common size for AR-15 mid-length builds, so both fixed and adjustable blocks will fit. The muzzle is threaded 1/2×28, so you can run flash hiders, brakes, or suppressors. Pair it with a mid-length gas tube to complete the setup.
Yes. The 1:7 twist is built to stabilize heavier projectiles like 62-grain and 77-grain loads, which is where it really shines. It still shoots lighter bullets just fine, so you get flexibility across a wide range of .223 and 5.56 ammunition.
The 4150 Chrome Moly Vanadium steel construction paired with a QPQ corrosion-resistant finish makes this a tough, long-lasting barrel. The QPQ treatment protects against rust and wear inside and out, and the coated M4 feed ramp extension helps keep chambering smooth. It's a proven setup that holds up well in real-world builds.
| UPC | 819747020314 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BABL556035M |
| Barrel Length | 13.9" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Color | Black |
| Model | |
| Product Type | Barrel |
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