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. Threaded
models feature 1/2"-28 threads for YHM muzzle brakes, flash hiders, and
suppressor.Available Threaded with a 1:7" or 1:9" twist.
Our barrels are designed to fit a 0.750" gas block.