R
RelentlessRobxsmall things to mention
Reviewed on May 15, 2026Verified with Build
works great. wish it came pre lapped
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Rosco Manufacturing Bloodline 5.56 Ar-15 Barrel M4 Carbine - 14.5"
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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.
Specifications
MPNBL-145-M4-556-7-C
Caliber5.56 NATO
PlatformAR-15
Action TypeSemi-Auto
ColorBlack
Barrel Length14.5
ComplianceStandard
Thread Pitch1/2x28
Gas System LengthCarbine
Barrel ProfileM4
CoatingQPQ/Nitride
Twist Rate1:7
Rosco Manufacturing Bloodline 5.56 Ar-15 Barrel M4 Carbine - 14.5"
Frequently Built With
Based on build data
Bravo Company Mfg Upper Receiver Assembly w/ Laser T-Markings, Hard Coated Anodized - 4-UR-M4
Aero Precision Ar-15 Breach Charging Handle Ambidextrous Small Levers
Wilson Combat Ar-15 Billet Upper Receiver
Wilson Combat Ar-15 Lo-Profile Gas Block .750" Black
Aero Precision Ar-15 5.56 Bcg W/c158 Bolt - Aero Logo - Phosphate
Bravo Company M16 Bolt Carrier Group Black
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
80.4%
AR-1580.4%
AR-1019.6%
CaliberBased on real build data showing which calibers builders choose alongside this product.
100%
5.56 NATO100%
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
100%
Carbine100%
| Product | Category | Times Built Together |
|---|---|---|
| Bravo Company Mfg Upper Receiver Assembly w/ Laser T-Markings, Hard Coated Anodized - 4-UR-M4 | 94 | |
| Aero Precision Ar-15 Breach Charging Handle Ambidextrous Small Levers | 74 | |
| Wilson Combat Ar-15 Billet Upper Receiver | 66 | |
| Wilson Combat Ar-15 Lo-Profile Gas Block .750" Black | 50 | |
| Aero Precision Ar-15 5.56 Bcg W/c158 Bolt - Aero Logo - Phosphate | 47 | |
| Bravo Company M16 Bolt Carrier Group Black | 45 |
| Platform | Percentage |
|---|---|
| AR-15 | 80.4% |
| AR-10 | 19.6% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 100% |
| Gas System | Percentage |
|---|---|
| Carbine | 100% |
Builds Featuring This Part
See all 91 →Builds in the community that include the Rosco Manufacturing Bloodline 5.56 Ar-15 Barrel M4 Carbine - 14.5"
| Build | Parts | Total |
|---|---|---|
 | 23 | $3711.50 |
 | 16 | $4571.30 |
 | 17 | $1367.35 |
 | 11 | $1065.63 |
 | 14 | $2257.88 |
 | 22 | $995.37 |
| 8 | $661.59 |
 | 22 | $983.99 |
| 10 | $752.91 |
| 28 | $2378.71 |
 | 14 | $4956.63 |
 | 12 | $2255.40 |
Customer reviews
4.8out of 5
4 global ratings
Top reviews
J
Jamie_arexcellent
Reviewed on May 8, 2026Verified with Build
twist rate stabilized everything i fed it
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B
BradenKyle782014Rosco 14.5 M4 carbine groups
Reviewed on April 30, 2026Verified with Build
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.
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C
clarkclint10104Rosco 14.5 headspace good
Reviewed on April 22, 2026Verified with Build
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.
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