This 16" Carbine Length Barrel is the perfect addition for your AR15 build. Crafted to mil- spec standards from 4150 Chrome Moly Vanadium with a QPQ corrosion resistant finish, this barrel provides time tested precision and accuracy in a lightweight package.This barrel is HP and MPI tested and includes a pinned "F" marked FSB.(DOES NOT INCLUDE Front Sight Post)May or may not be marked Ballistic Advantage.