Features and Specifications:

4150cmv Nitrided Barrel
Caliber: 5.56x45mm; RH TWIST 1:7
8.5″ in Length; Handguard retainer slots and extractor clearance are milled out
0.908” Journal Diameter
Gas Port Drilled. Works on Riley Krink Gas Blocks 1mm Thicker than original Krink Barrel.
Finish: Black Nitride
Manufacturer: Riley Defense Inc