Rosco 300 Blackout 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. Twist rates, gas port diameters, and lengths have all been taken into account.
| Barrel Length | 16" | |
| Barrel Weight | 30oz | |
| Barrel Material | 4150 CMV | |
| Barrel Caliber | 300 Blackout | |
| Barrel Profile | Heavy | |
| Twist | 1/8 | |
Barrel Threads | 5/8 x 24 | |
Gas Block Size | .750 | |
Gas System Length | Pistol Length | |
| Barrel Crown | 11 Degree | |
| Barrel Finish | Nitride | |
| Barrel Extension Finish | Nitride |
