These barrels are chambered in 5.56 NATO, made from 4140 steel , heat
treated to RC 25-32, and chrome lined. Fluted models feature YHMís
diamond fluting to improve rigidity and aid in barrel cooling. These
barrels feature M4 style feed ramps for reliable function. These barrels feature permanently attached muzzle accessories that bring the overall length of the barrel to a legal 16".Available with a 1:7" or 1:9" Twist
Our barrels are designed to fit a 0.750" gas block. †Our Pinned barrels require a two piece gas block since the muzzle accessory is permanently attached.