The HM Defense MonoBloc Upper is engineered for precision and durability featuring a 16-inch 4150 Chromoly match grade barrel expertly tripled honed and button rifled for superior performance. Its integral machined patented gas block and carbine gas system ensure reliability in any condition. The upper showcases a 15-inch M-LOK free-floating handguard made from 6061T6 aluminum offering versatility and strength in a sleek black hard coat anodized finish. Both the upper and lower receivers are constructed from 7075T6 aluminum boasting a robust black anodized finish. Complete with a patented HMB bolt Mil-Spec components a charging handle and a dust cover adorned with an American Flag this optic-ready upper is designed for those who demand excellence.