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Rosco built the Bloodline 16" M4 mid-length around USASOC criteria for an Improved Upper Receiver Group, then added a bit of their own engineering on top. The result is a barrel that runs the way a modern carbine should: the longer mid-length gas system spreads out the gas curve for smoother dwell times, which translates to softer cycling and less beating on your bolt carrier group. It's machined from 4150 chrome moly vanadium steel and finished in salt bath nitride, so it shrugs off corrosion and wipes clean without much fuss.
Instead of using the same gas port across the whole lineup, Rosco sizes the port, twist rate, and material to each specific barrel. This one gets a 1:7 twist that handles heavier match projectiles like 77gr just as happily as it runs bargain 55gr plinking ammo. The 5.56 NATO chamber eats both 5.56 and .223 Remington, and the properly sized port means you're not fighting an over-gassed gun. Builders consistently note tight groups right out of the gate, with plenty of folks reporting sub-MOA results once dialed in.
This is a bare barrel with an M4 contour, a .750 gas block journal, an 11-degree target crown, and a 1/2×28 threaded muzzle that takes any standard flash hider, comp, or suppressor mount. There's a dimple machined at the gas block location, which makes lining up and pinning a set-screw block a lot easier. It's a great backbone for an SBR, a pistol build, or a balanced patrol-style carbine. Pair it with a low-profile gas block and mid-length gas tube and you've got the makings of a rifle that punches well above its weight.
Rosco makes these in-house in Rhode Island, and their Bloodline line has earned a reputation for going the distance. If you want a barrel that cycles clean, holds accuracy, and won't quit on you, this one belongs on your short list.
This barrel runs a mid-length gas system, which is the sweet spot for a 16" AR-15. The longer gas system smooths out the gas curve and softens the cycling compared to a carbine setup, so you get more reliable function and a gentler recoil impulse. You'll want a mid-length gas tube and a .750 gas block to finish the build.
Yes. The 1:7 twist is built to stabilize heavier match projectiles up around 77gr, and it still shoots inexpensive 55gr plinking ammo just fine. It's the most versatile twist rate for 5.56, so you're covered whether you're loading premium match rounds or bulk range ammo.
No, this is sold as a bare barrel only. You'll need to add a .750 low-profile gas block and a mid-length gas tube to complete the assembly. Rosco does machine a dimple at the gas block location, which makes pinning a set-screw block much easier.
Absolutely. The 5.56 NATO chamber is fully compatible with .223 Remington, so you can run either round safely. Feeding it 5.56 gives you access to higher-pressure loads while .223 keeps range days affordable.
| UPC | 181969500074 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BL-16-GVT-556-7-M |
| Barrel Length | 16" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Color | Black |
| Length | 16" |
| Model | |
| Product Type | Barrel |
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