Rosco Bloodline Series 300 Blackout

The 8.2” Rosco barrel was designed for SBR and Pistol use in conjunction with suppressors. This is the shortest that we will go to allow you the flexibility of a shorter Personal Defense Weapon (PDW) without sacrificing performance or ballistics. ALL NFA RULES APPLY!

The 10.5” Rosco Manufacturing 300 Blackout barrel was designed for SBR and Pistol use in conjunction with suppressors. The 10.5” Rosco barrel was made to be a direct replacement for any MK 18 platforms that are currently in 5.56 NATO. The 10.5” barrel is also perfect for carbines which require a slightly longer rail in order to run PEQ-15’s, D-BAL (series), or any laser aiming devices comfortably. ALL NFA RULES APPLY!

The 16” Rosco 300 Blackout barrel is perfectly suited for carbines shooters that plan on running only supersonic ammo, or are building a well-balanced hunting platform. Our Rosco .300 Black Out barrels were created by using input from SOCOM end users and some of the original creators of the 300 Blackout caliber. Every barrel was designed to optimize the original role for this caliber; to be suppressor friendly and accurate. It is our goal to get you the performance that you seek out of these AR-15 barrels when running sub-sonic ammo or supersonic ammo (depending on barrel length). Twist rates, gas port diameters, and lengths have all been taken into account when we set out to make these. Let’s just say that we don’t like leaving things to chance.

Barrel Material
4150 CMV

Barrel Caliber
300 BLK

Barrel Profile
Heavy

Twist
1/7

Barrel Thread
5/8 x 24

Gas Block Size
.750

Gas System Length
Pistol

Barrel Crown
11 Degree

Barrel Finish
Nitride

Barrel Extension Finish
Nitride