works great. wish it came pre lapped





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Rosco Manufacturing
Overview
The Rosco Manufacturing Bloodline 5.56 AR-15 Barrel is a 14.5-inch M4 profile barrel designed for use with a carbine-length gas system. With a twist rate of 1:7, it effectively stabilizes a wide range of bullet weights, making it versatile for different ammunition choices. This barrel is commonly found in builds that emphasize a compact design while maintaining the reliability and performance expected from a 5.56 NATO caliber setup.
Based on build data

Bravo Company Mfg Upper Receiver Assembly w/ Laser T-Markings, Hard Coated Anodized - 4-UR-M4

Wilson Combat Ar-15 Billet Upper Receiver

Aero Precision Ar-15 Breach Charging Handle Ambidextrous Small Levers

Wilson Combat Ar-15 Lo-Profile Gas Block .750" Black

Aero Precision Ar-15 5.56 Bcg W/c158 Bolt - Aero Logo - Phosphate

Wmd Guns Ar-15 Gas Tube Nitromet Mid-Length
Aggregated and anonymized data showing how builders use this product
| Product | Category | Times Built Together |
|---|---|---|
| Bravo Company Mfg Upper Receiver Assembly w/ Laser T-Markings, Hard Coated Anodized - 4-UR-M4 | 63 | |
| Wilson Combat Ar-15 Billet Upper Receiver | 59 | |
| Aero Precision Ar-15 Breach Charging Handle Ambidextrous Small Levers | 57 | |
| Wilson Combat Ar-15 Lo-Profile Gas Block .750" Black | 45 | |
| Aero Precision Ar-15 5.56 Bcg W/c158 Bolt - Aero Logo - Phosphate | 36 | |
| Wmd Guns Ar-15 Gas Tube Nitromet Mid-Length | 36 |
| Platform | Percentage |
|---|---|
| AR-15 | 80.4% |
| AR-10 | 19.6% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 100% |
| Gas System | Percentage |
|---|---|
| Carbine | 100% |
Builds in the community that include the Rosco Manufacturing Bloodline 5.56 Ar-15 Barrel M4 Carbine - 14.5"
| Build | Parts | Total |
|---|---|---|
![]() | 23 | $3700.81 |
![]() | 16 | $4605.79 |
![]() | 17 | $1449.03 |
![]() | 11 | $1090.27 |
![]() | 14 | $2271.00 |
![]() | 22 | $1031.93 |
![]() | 8 | $668.41 |
![]() | 22 | $1000.59 |
![]() | 10 | $758.19 |
![]() | 28 | $2469.42 |
![]() | 14 | $4786.76 |
![]() | 12 | $2203.06 |
4 global ratings
works great. wish it came pre lapped
twist rate stabilized everything i fed it
Rosco Bloodline 14.5 inch barrel in M4 contour groups consistently sub 1.5 MOA. Carbine gas at 14.5 is a bit harsh but it cycles reliably. Chrome lined for longevity. Solid mid-tier barrel choice.
Rosco Bloodline 14.5 inch M4 carbine barrel had correct headspace out of the box. Standard mil-spec gas port. Cycles 5.56 reliably with M193 and M855 ball. Chrome lined for longevity. Drops in to a standard upper with no fitting.