AR-15 10.5\" M4 Contour Barrel, 5.56 NATO, 1:7, Parkerized

Premium Grade Parkerized AR-15 M4 Profile Barrel, 10.5\" with a 1 in 7 twist.Gas port drilled for carbine length gas set up and threaded for comp. Barrel Extension in the rear with M4 feed ramps... drilled with a .093\" gas port opening at carbine length. It has a .750 gas block diameter, ready to install into the receiver.5.56 NATO Don\'t forget the AeroShell 33MS Mil Spec Armorer\'s Grease!