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The Rosco Bloodline 14.5" barrel is one of those parts that just does its job right without asking for a second thought. It's machined in-house at Rosco's Rhode Island shop from 4150 chrome moly vanadium steel, the same tough alloy used on military-spec barrels, then finished with a salt bath nitride treatment that resists corrosion and makes cleanup a whole lot easier. The M4 profile and 14.5" length give you that classic carbine handling that so many builders reach for.
This one runs a carbine-length gas system, which pairs naturally with the 14.5" barrel length for consistent, reliable cycling across a wide range of ammo. The 1:7 twist rate is the workhorse choice for 5.56, stabilizing everything from lighter varmint-weight rounds up to the heavier 77-grain match projectiles without complaint. It's chambered in 5.56 NATO, so you get the flexibility to run both 5.56 and .223 Rem through it.
The muzzle comes threaded 1/2×28, which is the standard pitch for 5.56, so your flash hider, muzzle brake, or suppressor mount will thread right on. Up front you've got a .750" gas block journal that plays nice with the vast majority of clamp-on and set-screw gas blocks out there. It's capped off with an 11-degree target crown to help protect accuracy at the muzzle, and the whole barrel tips the scales right around 26 ounces.
Rosco has earned a solid reputation with the Bloodline line for barrels that are properly gassed, cleanly machined, and priced where a working builder can actually stomach it. Folks who've run these tend to point out the tight tolerances and the lack of flyers on the range. Whether you're putting together a patrol carbine, a duty gun, or just a dependable range rig, this is a barrel that punches above its weight and holds up round after round.
This particular version (part number BL-145-M4-556-7-C) runs a carbine-length gas system. Rosco also offers a 14.5" Bloodline in a mid-length configuration, so double-check the part number and gas tube you're pairing it with. If you want the carbine setup, this is the one you're after.
The 1:7 twist is the most versatile option for 5.56 and handles a wide spread of bullet weights. It'll stabilize lighter 55-grain loads just fine and really shines with heavier 62 to 77-grain projectiles. That makes it a great all-around choice whether you're plinking, training, or reaching out with match ammo.
Yes. The muzzle is threaded 1/2×28, which is the standard pitch for 5.56 barrels, so flash hiders, brakes, compensators, and suppressor mounts will thread right on. Rosco tunes their gas ports with suppressed shooting in mind, so it's a solid platform for running a can.
It's cut from 4150 chrome moly vanadium steel, a durable alloy chosen for its strength and heat tolerance under sustained fire. The barrel is then treated with a black nitride (QPQ) finish that boosts corrosion resistance and makes cleaning easier. Together they give you a barrel built to hold up over high round counts.
| UPC | 181969500043 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BL-145-M4-556-7-C |
| Length | 14.50" |
| Model | |
| Color | Black |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Barrel Length | 14.5" |
| Product Type | Barrel |
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