The MonoBloc Upper features a HM barrel with an integral machined patented gas block, and a carbine gas system. It is also 4150 Chromoly, match grade, tripled honed, and button rifled. Its handguard is free-floating and uses a Picatinny rail, Magpul M-LOK, and machined from 6061-T6 aluminum. Upper and Lower receiver are made of 7075-T6 aluminum with a hard coat anodized finish. The MonoBloc Upper also includes a patented HMB bolt, Mil-Spec components, charging handle, and a dust cover with an American Flag.
Specifications:

Type	Complete
Caliber	223 Rem
Sights	Optic Ready
Barrel Length	16"
Barrel Material	4150 Chrome Moly
Twist	1:8"
Barrel Description	4150 Chrome Moly Match Grade
Barrel Finish	Black Cerakote
Receiver Description
Receiver Finish	Black Anodized
Handguards	15" M-LOK Free-Float
Handguard Finish	Black Hard Coat Anodized
Barrel Length Range	16" to 16.99"