Fluted 1x9 twist, chrome moly, 16" barrel is mounted on aircraft quality forged aluminum upper. Coated evenly with tough parkerization. Fluting reduces flex, and vibration of the barrel, while increasing rigidity and decreasing weight. Upper comes fully assembled
(minus bolt/carrier and charging handle. see options to add these items)
**Note, YHM Free Float Hand Guards have an available end cap, This is an Added Option for those.**