Rosco Manufacturing Bloodline 16″ 5.56 Government 1:7 Twist Black Nitride Midlength Barrel
16″ M4 5.56 NATO Mid-Length Bloodline Barrel (Mid-Length): This 16″ M4 5.56 NATO Mid-Length barrel was designed around the USASOC specs for an Improved Upper Receiver Group with a little bit of the Rosco touch as well. The longer gas system allows for a smoother gas curve, leading to managed dwell times. This combo creates an outstanding balance of speed and performance.
Our Rosco 5.56 (NATO) barrels are designed to meet the modern-day carbine shooter’s requirements. We are far from our daddy’s “Sporter” AR, and those specs won’t cut it anymore. From properly managed dwell times for SBRs, to running suppressed, or setting up a balanced patrol carbine, we have incorporated your needs into our engineering. We have accomplished this by picking the correct twist rates, gas port diameters, and barrel materials according to the barrel we make (not a lazy blanket method). We have also balanced input from our consumers and military end users to bring you the product you need, not just the one we want to sell you.
Specifications
- Barrel Length: 16″
- Barrel Weight: 28.97 oz
- Barrel Material: 4150 CMV
- Barrel Caliber: 5.56
- Barrel Profile: M4
- Twist: 1:7
- Barrel Thread: 1/2 x 28
- Gas Block Size: .750
- Gas System Length: Mid-Length
- Barrel Crown: 11 Degree
- Barrel Finish: Nitride
- Barrel Extension Finish: Nitride
- Weight: 2.0 lbs
- Dimensions: 19.5 × 2.3 × 2.2 in








Gerry –
Top Quality
This is a great barrel, I was happy to see they had it in stock! It came fast and exactly as I hoped it would, perfect.
Gail –
Roscommon bloodline 16” barrel
As expected good quality
Gail –
Rosco bloodline barrel
Great product as expected test shooting soon