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The Faxon Duty Series 10.5" Pencil barrel is one of those parts that quietly does exactly what a lightweight build needs. It's machined from certified 4150 CMV steel, button rifled with a 1:8 twist, and coated in black nitride inside and out. The pencil contour is the real story here, keeping weight down around 0.9 lb so the whole rifle balances and swings faster. Faxon has a reputation for pencil barrels that punch above their weight class when it comes to accuracy, and folks who've run them tend to report tight groups from a profile this thin.
At 10.5 inches with a carbine-length gas system, this barrel is aimed straight at AR pistol and SBR builds where trimming ounces up front actually changes how the gun handles. The carbine gas setup gives you better dwell and more consistent cycling than you'd get out of a pistol-length gas system on a barrel this short, which matters for reliability. Owners running short suppressed and red dot setups have mentioned MOA and sub-MOA groups at 100 yards with quality ammo, and a few noted that the thin profile didn't heat up as badly as expected and cooled off quickly.
The 1:8 twist is the sweet spot for 5.56, stabilizing everything from lighter varmint loads up through heavier match bullets, so you're not locked into one bullet weight. The muzzle is threaded 1/2×28 for your brake, flash hider, or suppressor, and it wears a recessed 11-degree target crown to protect the rifling right where it matters. It uses a standard M4 barrel extension, so it drops into any mil-spec AR-15 upper without surprises.
Faxon builds these in-house in Cincinnati, and every barrel gets stress relieved, air-gauge tested, magnetic particle inspected, and headspace checked with hardened gauges. That kind of process control is a big part of why the Duty Series has earned the trust it has among builders looking for a lightweight barrel that still shoots.
This 10.5" pencil profile is built for compact AR-15 pistol and SBR setups where reducing front-end weight really pays off. The thin contour and short length make the rifle quicker to point and easier to maneuver in tight spaces. It's a favorite for lightweight and suppressed builds where every ounce matters.
Yes, the 1:8 twist is a versatile choice for 5.56 and .223. It stabilizes lighter varmint loads and heavier match bullets alike, so you're not boxed into one specific weight. That makes it a solid all-around pick for both defensive and target shooting.
No, this barrel ships on its own without a gas block, gas tube, or muzzle device. You'll want a carbine-length gas system to match, along with a 0.625" gas block. If you'd rather skip the alignment work, Faxon does offer a version of this barrel with a factory pre-pinned gas block.
Pencil barrels sometimes get a bad reputation for trading accuracy for weight, but Faxon's are known for shooting well above their contour. Reviews commonly report MOA and even sub-MOA groups at 100 yards with quality ammunition. Every barrel is air-gauge tested and stress relieved in-house, which helps keep that consistency.
| UPC | 816341023086 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 15A58C10NPQ |
| Barrel Length | 10.5'' |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Length | 10.5'' |
| Model | |
| Product Type | Barrel |
| Sights | No |
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