The Rosco Manufacturing Bloodline Barrel (brand part no. BL-16-GVT-556-7-M) is a 16-inch, mid-length 5.56 NATO barrel built around USASOC specs for an Improved Upper Receiver Group, with Rosco’s own tuning applied on top. The mid-length gas system runs a longer gas port than a standard carbine-length setup, which smooths out the gas curve feeding the bolt carrier and manages dwell time more evenly through the cycle. That combination is what Rosco is aiming for with the Bloodline line: a barrel that balances quick handling with the kind of consistent performance a longer gas system delivers.

Key Specifications

• Chambered in .223 Rem/5.56 NATO.
• Measures 16 inches in an M4 contour.
• 1:7 twist rate.
• Runs a mid-length gas system for a smoother gas curve.
• Built around USASOC specifications for an Improved Upper Receiver Group.

Frequently Asked Questions

What gas system does this use? Mid-length, which Rosco uses to smooth the gas curve and manage bolt carrier dwell time.

What twist rate does it use? A 1:7 twist.

Buy the Rosco Bloodline 5.56 NATO Barrel, 16in

Get a balanced, USASOC-spec barrel for your next build. Order the Rosco Manufacturing barrel from our AR15 barrels selection at our Lubbock, Texas gun shop for fast, direct shipping.