Premium Grade Parkerized AR-15 Rifle Barrel, 16" Contour M4 Barrel,1 in 9 twist. Gas port drilled for carbine length gas set up, and threaded for comp.
Barrel Extension in rear with M4 feed ramps, drilled with a .070" gas hole at carbine length. It has a .750 gas block diameter ready to install into receiver.
.223 / 5.56 Nato