Aero Precision APRH100067C: This 14.5\" 5.56 Mid-Length Barrel is the perfect addition to 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 for your AR15 build. This build includes a pinned VG6 Gamma 556SL to get your build started. This barrel is HP and MPI tested. This package deal includes a 14.5\" 5.56 Barrel with a pinned and welded Gamma 556SL. With the muzzle device being permanently welded, the setup gives you a 16\"+ overall length for your rifle build.