Rosco Bloodline 12.5in 5.56 NATO 4150 CMV Nitride AR-15 Barrel BL-125-M4-556-7-C
User Ratings
No ratings yet
Be the first to review this product
Rosco Manufacturing Bloodline 12.5" 5.56 NATO AR-15 Barrel (BL-125-M4-556-7-C)
The Rosco Manufacturing Bloodline 12.5" 5.56 NATO barrel is built to bridge the gap between SBR/pistol and RECCE platforms, delivering precision performance in a compact configuration.
Product Highlights
- Premium 4150 CMV Steel: Machined from 4150 Chrome Moly Vanadium steel for strength, reliability, and longevity.
- Full Nitride Treatment: Nitride finish on both the barrel and barrel extension for improved wear resistance and corrosion protection.
- Government Profile + Carbine Length Gas System: Tuned for a compact 12.5" build and reliable cycling.
- 1:7 Twist Rate: Stabilizes a broad range of 5.56 NATO projectile weights.
- 1/2x28 Threaded Muzzle w/ 11-Degree Crown: Compatible with standard AR-15 muzzle devices; the 11-degree crown supports consistent accuracy.
Specs
- Brand: Rosco Manufacturing
- MPN: BL-125-M4-556-7-C
- UPC: 181969500036
- Caliber: 5.56 NATO
- Barrel Length: 12.5 in
- Barrel Weight: 21.79 oz
- Barrel Material: 4150 CMV
- Barrel Profile: Government
- Twist Rate: 1:7
- Thread Pattern: 1/2 x 28
- Gas Block Size: .750 in
- Gas System Length: Carbine Length
- Barrel Crown: 11 Degree
- Barrel Finish: Nitride
- Barrel Extension Finish: Nitride
- Compatible Platform: AR-15
Specifications
- Manufacturer:
- Rosco Manufacturing
- Category:
- barrel
- Caliber:
- 5.56x45mm NATO
- Platforms:
- AR-15
- Interfaces:
- Muzzle thread: 1/2-28
- Weight:
- 21.79 oz (1.36 lbs)
- Length:
- 12.5"
- Estimated velocity:
- 2,450-2,825 fps
- UPC:
- 8258532900986
- MPN:
- BL-125-M4-556-7-C
- Required Component:
- Yes
Estimate only. Based on caliber + barrel length bucket. View details
Parts Cabinet
Track parts you own or plan to buy.
Where to Buy
Have one to sell?
Sponsored
MantisX
The smart way to train your AR build
Built your rifle — now train it. BlackBeardX installs in minutes and turns your AR into a full dry fire system with smart feedback on every pull.
Shop BlackBeardXPrice History
Current
$157.98
Lowest
$157.98
Highest
$157.98
Price Alert
Sign in to save a target price and receive an email when this component drops.
Sign In to Set AlertSimilar Products

Daniel Defense 16in 5.56mm NATO Carbine Length M4 Profile Barrel 07-075-08174-018
Daniel Defense
$338.00

Faxon Duty Series AR-15 Barrel 5.56x45mm NATO 10.5 Pencil Contour 1:8 Twist Black Nitride
Faxon Firearms
$132.40

Criterion Barrels CORE 223 Wylde Carbine AR-15 Barrel 11.5in
Criterion Barrels Inc
$313.49

14.5-inch 5.56 Government Profile Midlength AR 15 Barrel, Modern Series (OEM)
Ballistic Advantage
$170.00

Criterion Barrels Core AR-15 Barrel 223 Wylde 13.9" Mid-Length Chrome-Lined 1:8" Twist Black
Criterion Barrels Inc
$313.49

Criterion Barrels Core AR-15 Barrel 223 Wylde 14.5" Mid-Length Chrome-Lined 1:8" Twist Black
Criterion Barrels Inc
$313.49

LMT Defense Chrome Lined Mid-Length Twist Barrel 5.56x45mm/.22 Cal 16" Fits LMT Defense L7S1A, Black
LMT
$472.99

Daniel Defense AR-15 5.56 NATO Barrel 11.5in Government Contour 1:7 Twist Phosphate
Daniel Defense
$289.99
Builds Using This Part
No builds yet — be the first to use this part.
Related Guides
Guide
5.56 NATO, .223 Remington, and .223 Wylde: Chamber Differences Explained
A technical breakdown of the differences between 5.56 NATO, .223 Remington, and .223 Wylde chambers — what each accepts safely, and how to choose for your build.
5 min read
Guide
The AK Platform: Core Design, Strengths, and Builder Tradeoffs
A practical AK overview covering operating system basics, parts ecosystem realities, and where the AK platform shines compared to AR-pattern rifles.
8 min read
Guide
.308 Win vs. 6.5 Creedmoor for AR-10 Builds
A technical comparison of .308 Winchester and 6.5 Creedmoor for AR-10 platform builds — covering ballistics, recoil, parts availability, and which cartridge fits which use case.
5 min read