Dirty Bird Bakersfield
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Description
The Dirty Bird 11.5″ 5.56 M4 Carbine barrel is the short, fast, handy end of the AR-15 lineup — the length that built every carbine you’ve ever seen slung across a plate carrier. Machined from CrMoV steel with a chrome-lined bore and chamber, it’s made to take heat and abuse. That matters more here than anywhere else in the catalog: short barrels heat soak quickly and burn throats faster, and chrome lining is what keeps a hard-used 11.5″ shooting straight long after a bare bore would be washed out.
The 5.56 NATO chamber eats standard 55gr, duty-grade 62gr, and .223 Rem without drama, and the 1:7 twist keeps heavier projectiles stable even at short-barrel velocities. Carbine-length gas is the correct, proven pairing at this length — it’s what keeps the gun cycling when it’s dirty, cold, or running a can, and it’s the reason this configuration has stayed in service for as long as it has. The M4 profile with phosphate-coated M4 feed ramp extension drops into any standard M4-cut upper.
Up front is a pinned F-marked front sight base, the taller FSB cut for flat-top upper receivers. Run a detachable carry handle or a standard-height rear BUIS and your zero lands where it should — no shimming, no holding low.
It ships with the handguard cap, delta ring assembly, and front sling swivel already installed, so it takes standard carbine-length two-piece drop-in handguards straight out of the box. Bolt it up, headspace it, and you have a genuinely compact rifle that clears doorways, rides in a truck, and still hits like a 5.56.
All NFA/ATF rules apply.
Backed by the Dirty Bird lifetime guarantee.
FEATURES
- 11.5″ barrel length — the classic compact carbine spec
- Chrome-lined bore and chamber for extended barrel life under hard, hot use
- Pinned F-marked front sight base — correct sight height for flat-top uppers
- Ships with handguard cap, delta ring assembly, and sling swivel — ready for standard carbine-length two-piece drop-in handguards
- CrMoV (chrome moly vanadium) steel construction
- Manganese phosphate exterior finish
- 5.56 NATO chamber — safely runs 5.56 NATO and .223 Rem
- 1:7 twist stabilizes 55gr through 77gr projectiles
- Carbine-length gas system — proven reliability at this barrel length
- M4 profile with phosphate-coated M4 feed ramp extension
- 1/2×28 threaded muzzle accepts standard AR-15 muzzle devices and suppressor mounts
IN THE BOX
- 11.5″ 5.56 M4 profile barrel
- Pinned F-marked front sight base and assembly
- Handguard cap
- Delta ring assembly
- Front sling swivel
Dirty Bird Industries — Premium AR-15 and AR-10 Components, Built to Last.
Designed for builders who demand uncompromising quality, reliable performance, and accessible pricing without the premium markups common from larger brands.
Founded by Builders, Built to Last
Founded in 2015 by brothers Jay and Dustin Pitcher in a Bakersfield, California garage, Dirty Bird Industries started as a family-owned operation specializing in custom Cerakote finishes and high-quality AR parts. Building on experience from its sister site, AR15Discounts.com, Dirty Bird Industries has grown into a nationwide company with a dedicated team focused on American-made gear that shooters trust.
American-Made Quality and Precision
Through strategic partnerships with leading domestic manufacturers, Dirty Bird Industries sources and develops components using advanced CNC machining, rigorous testing, and mil-spec standards. By managing larger volumes, the company delivers proven, high-end materials and precision engineering at fair prices that meet the high standards set for its own builds.
Proven Components for Serious Builds
Standout offerings include precision-forged 7075-T6 upper and lower receivers, enhanced black nitride bolt carrier groups, single-stage nickel Teflon triggers, free-float M-LOK handguards, complete upper assemblies, and comprehensive lower parts kits. These products create a cohesive selection for everything from custom builds to high-performance rifles nationwide, supported by batch inspections, mil-spec compliance, and ongoing innovations.
Zero Risk Guarantee Program
For total confidence, Dirty Bird Industries backs eligible parts and accessories with its Zero Risk Guarantee Program. This includes free shipping on orders over $50, package protection up to $5,000, lifetime free returns with full refunds within 45 days or store credit after, and expert support. As passionate shooters, the team at Dirty Bird Industries stands behind every product because the company builds, tests, and uses them too, providing authentic value and dependable gear.
Additional information
| Weight | 20.8 oz |
|---|---|
| Dimensions | 13.5 × 2 × 4 in |
| Finish | Phosphate + Chrome Lined |
| Barrel Profile | M4 |
| Cartridge Compatibility | 5.56 NATO |
| Gas Block Journal | 0.75 |
| Barrel Length | 11.5 |
| Gas System Length | Carbine |
| Platform | AR-15 |
| Twist Rate | 1:7 |
| Muzzle Thread Pattern | 1/2×28 |
| MPN | D265 |
| UPC | 810084375136 |
Compliance
NFA (National Firearms Act) compliance is crucial for legal ownership and transfer of regulated firearms and accessories like short-barreled rifles, suppressors, and certain types of ammunition, ensuring adherence to federal regulations to avoid legal penalties and ensure responsible firearm ownership.
