Aero Precision Gov AR15 Barrel 5.56 NATO - 20" |1:7 Twist | 4150 CMV | Rifle Length w/ Pinned FSB

This barrel is HP and MPI tested and includes a pinned "F" marked FSB. (DOES NOT INCLUDE Front Sight Post) SPECS Specs Caliber 5.56 NATO Barrel Length 20" Barrel Material 4150 Chrome Moly Vanadium Barrel Finish QPQ Corrosion Resistant Gas System Length Rifle Gas Block Journal .750" Gas Port Size (inches) 0.0890 Barrel Rifling Button Rifling Twist Rate 1:7 inches Thread Pitch 1/2-28 Threaded Barrel Extension M4 Weight(s) 40.32oz