Aero Precision AR15 Barrel 5.56 NATO - 16" |1:7 Twist | 4150 CMV | Carbine 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 16" Barrel Material 4150 Chrome Moly Vanadium Barrel Finish QPQ Corrosion Resistant Gas System Length Carbine Gas Block Journal .750" Gas Port Size (inches) 0.0635 Barrel Rifling Button Rifling Twist Rate 1:7 inches Thread Pitch 1/2-28 Threaded Barrel Extension M4 Weight(s) 33.92oz