Product DescriptionThe LUXUS ARMS (HM DEFENSE) MonoBloc Upper is a complete AR-15 upper receiver assembly built for hard use and consistent accuracy. It features an HM 16-inch match-grade 4150 chromoly barrel with an integral, patented machined gas block and a carbine-length gas system for dependable cycling. The free-float handguard combines a full-length Picatinny top rail with Magpul M-LOK mounting slots and is precision-machined from 6061-T6 aluminum. The receiver is made from strong 7075-T6 aluminum with a hard-coat anodized finish, and the upper comes equipped with a patented HMB bolt, Mil-Spec components, a charging handle, and a dust cover featuring an American flag.Product Highlights MonoBloc design with integral patented machined gas block and carbine gas system for reliable performance 16-inch match-grade 4150 chromoly barrel, triple honed and button rifled for accuracy and durability 15-inch free-float handguard with Picatinny top rail and Magpul M-LOK slots for flexible accessory mounting Premium aluminum construction: 7075-T6 receiver and 6061-T6 handguard with durable black finishes Complete upper includes patented HMB bolt, charging handle, and American-flag dust coverSpecs Brand: LUXUS ARMS (HM DEFENSE) Manufacturer Part Number: 16MBUP556 UPC: 854164007005 Platform: AR-15 Type: Complete upper receiver assembly Caliber: .223 Rem / 5.56x45mm NATO Barrel Length: 16 in Barrel Material: 4150 chromoly, match grade Rifling: Triple honed; button rifled Twist Rate: 1:8 Barrel Finish: Black Cerakote Gas System: Carbine Gas Block: Integral machined patented gas block Handguard: 15 in free-float; Magpul M-LOK; Picatinny top rail Handguard Material: 6061-T6 aluminum Receiver Material: 7075-T6 aluminum Receiver Finish: Black hard-coat anodized Sights: None (optic ready) Included Components: Patented HMB bolt, Mil-Spec components, charging handle, dust cover (American flag)Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the products manufacturer.