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Description 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 rial, 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. Patented HM MONOBLOC Barrel with integrally machined Gas Block Free-float rail with Picatinny and M-Lok Patented HMB Bolt which replaces cam pin hole with cam pin socket and tapered cam pin Additional information Weight 64 oz Dimensions 28 × 5 × 5 in Barrel Finish Other Cartridge Compatibility 5.56 NATO Barrel Length 16" Gas System Length Midlength Twist Rate 1-8 BCG / Charging Handle Included MPN 16MBUP-556 UPC 854164007005