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Rosco Manufacturing Bloodline 5.56 NATO Barrel Up to 27% Off Plus Blazin' Deal w/ Free S&H — 6 models

Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 12.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-125-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 10.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-105-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 11.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-115-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 16in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-16-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 12.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-125-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 12.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-125-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 12.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-125-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 10.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-105-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 10.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-105-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 11.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-115-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 16in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-16-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 12.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-125-M4-556-7-C
1 of 15 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 12.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-125-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 10.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-105-M4-556-7-C
2 of 15 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 10.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-105-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 11.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-115-M4-556-7-C
3 of 15 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 11.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-115-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 16in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-16-M4-556-7-C
4 of 15 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 16in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-16-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-M4-556-7-C
5 of 15 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 12.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-125-M4-556-7-C
6 of 15 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 12.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-125-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 12.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-125-M4-556-7-C
7 of 15 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 12.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-125-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 12.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-125-M4-556-7-C
8 of 15 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 12.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-125-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 10.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-105-M4-556-7-C
9 of 15 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 10.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-105-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 10.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-105-M4-556-7-C
10 of 15 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 10.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-105-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 11.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-115-M4-556-7-C
11 of 15 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 11.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-115-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 16in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-16-M4-556-7-C
12 of 15 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 16in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-16-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-M4-556-7-C
13 of 15 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-M4-556-7-C
14 of 15 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-M4-556-7-C
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-M4-556-7-C
15 of 15 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-M4-556-7-C

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Questions & Answers
What length gas system does it need? Expert Answer

MPN: BL-105-M4-556-7-C uses a CARBINE length gas system.

by Armando R., Gear Expert, August 29, 2019
See 3 More Answers
Is the barrel dimpled for gas block Expert Answer

No, the barrel is not dimpled.

by Ben, Gear Expert, June 2, 2021
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
Garand Thumb likes them! by DoItAll, Verified Owner, April 30, 2022
After looking at the dozen or more options out there I decided to go with this barrel for a pistol build because they are cheap in price without being cheap in quality. I did watch a review from Garand Thumb and he ran one suppressed for tens of thou...
Read More...
3/5 found this helpful
Helpful Positive Review
12.5" BARREL by Daniel, Verified Owner, March 9, 2022
This length has become my new favorite pistol build length. I have have a few Bloodline barrels and am super pleased with them and as a plus they come pre-dimpled! The finish is superb and the packaging is amazing. I definitely recommend ourchasing a...
Read More...
2/2 found this helpful
Helpful Positive Review
Rosco 5.56 barrel by Kyle, May 6, 2022
Very good barrel for the price! Ran it for a couple of classes and put several thousand round through with no issues. Got the barrel very hot and shooting both steel and brass ammo and the rifling shows no wear at all.
1/1 found this helpful
Helpful Positive Review
Great all the way around by Sal, Verified Owner, May 14, 2022
I bought this barrel along with a FN barrel that was 2-3x as much. And I’d be hard pressed to find any noticeable difference in anyway. Except this barrel came dimpled and the FN did not. I will definitely be buying a few more in the coming months. I...
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2/2 found this helpful
Helpful Positive Review
awesome price for an awesome barrel. by M, Verified Owner, June 24, 2022
I used this barrel for a retro XM177E2 re-barrelling. So far no issues, it's accurate (for an 11.5" lol), and it's not too expensive. I've seen much much worse barrels for more than this one, and this is a good one. I watched a video from garandthumb...
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2/2 found this helpful
Helpful Positive Review
11.5" Bloodline barrel by Daniel, Verified Owner, August 8, 2022
I have several Roscoe brand barrels, BCG's and gas blocks. All of their stuff is high quality and definetly punches way above their price. I wouldn't hesitate to purchase any parts from Roscoe. Their packaging is also top quality, that shouldn't matt...
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Read All 62 Reviews

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made-in-usa-flag Made in USA

Help support American manufacturing! Marked models of this product have gone through rigorous review and been certified by the manufacturer as Made in the USA.

Product Info for Rosco Manufacturing Bloodline 5.56 NATO Barrel

Rosco Manufacturing 5.56 (NATO) barrels are designed to meet the modern day carbine shooters requirements. We are a long way from our daddy's "Sporter" AR, and those specs just won't cut it anymore. From properly managed dwell times for SBR's, to running Suppressed, or setting up a balanced patrol carbine Rosco has incorporated your needs into their engineering. Rosco has successfully accomplished this by picking the right twist rates, gas port diameters, and barrel materials according to the barrel they are making (not a lazy blanket method). They have also balanced input from their consumers and military end users in order to bring you the AR15 Barrels you need, not just the one they want to sell you.image

Specifications for Rosco Manufacturing Bloodline 5.56 NATO Barrel:

Manufacturer: Rosco Manufacturing
Color: Black
Finish: Nitride
Fabric/Material: 4150 CMV Material
Caliber: 5.56x45mm NATO
Barrel Profile: M4
Barrel Twist Rate: 1-7
Barrel Material: 4150 Chrome Moly Vanadium
Flutes: No
Gun Make: AR Platform
Gun Model: M4
Gas Block Journal Size-Length: 1.2 in
Firearms Threads Per Inch: 1/2x28
Country of Origin: USA
Gas System: Carbine Length

Features of Rosco Manufacturing Bloodline Barrel, M4 5.56 NATO

  • Gas Block Size .750
  • Barrel Crown 11 Degree

Package Contents:

  • Rosco Manufacturing Bloodline Barrel, M4 5.56 NATO

What firearm models does the manufacturer say Rosco Manufacturing Bloodline 5.56 NATO Barrel is compatible with?

The manufacturer suggests that Rosco Manufacturing Bloodline 5.56 NATO Barrel is compatible with M4

Rosco Manufacturing Bloodline 5.56 NATO Barrel Orderable Models

List of Orderable Models

  • Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 12.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-125-M4-556-7-C , MPN: BL-125-M4-556-7-C , UPC: 181969500036 , Code: 3FY-ATB-953GA-BL-125-M4-556-7-C
  • Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 10.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-105-M4-556-7-C , MPN: BL-105-M4-556-7-C , Code: 3FY-ATB-953GA-BL-105-M4-556-7-C
  • Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 11.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-115-M4-556-7-C , MPN: BL-115-M4-556-7-C , UPC: 2619651 , Code: 3FY-ATB-953GA-BL-115-M4-556-7-C
  • DEMO, Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-M4-556-7-C , MPN: BL-145-M4-556-7-C-DEMO , Code: 3FY-ATB-953GA-BL-145-M4-556-7-C-DEMO-OB-A
  • Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-M4-556-7-C , MPN: BL-145-M4-556-7-C , UPC: 181969500043 , Code: 3FY-ATB-953GA-BL-145-M4-556-7-C
  • Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 16in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-16-M4-556-7-C , MPN: BL-16-M4-556-7-C , UPC: 181969500067 , Code: 3FY-ATB-953GA-BL-16-M4-556-7-C

Rosco Manufacturing Bloodline 5.56 NATO Barrel Unavailable & Discontinued Models

List of Unorderable Models

  • Open Box, Dealer Demo, Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 10.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-105-M4-556-7-C , MPN: BL-105-M4-556-7-C-DMO , Code: 3FY-ATB-953GA-BL-105-M4-556-7-C-DMO
  • Demo, Rosco Manufacturing Bloodline Barrel, M4 5.56 NATO, 11.5in, 1/7 Twist 1/2x28 TPI, 4150 CMV, Black Nitride, ROSBL-115-M4-556-7-C , MPN: BL-115-M4-556-7-C-DEMO , Code: 3FY-ATB-953GA-ROSBL-115-M4-556-7-C-DEMO
  • Open Box, Dealer Demo, Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 11.5in, Carbine, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-115-M4-556-7-C , MPN: BL-115-M4-556-7-C-DMO , Code: 3FY-ATB-953GA-BL-115-M4-556-7-C-DMO
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Last updated 2026-08-05 UTC.