Product DescriptionThe LUXUS ARMS (HM DEFENSE) MonoBloc Upper is a complete AR-15 pistol upper engineered for shooters who want a compact, high-performance setup in .223 Remington and 5.56x45mm NATO. Built around a 12.50-inch 4150 chrome moly match grade barrel, this upper features a Black Cerakote finish, a 1:8 twist rate, and a carbine-length gas system with an integral machined patented gas block. The barrel is tripled honed and button rifled for enhanced consistency and performance.This MonoBloc Upper pairs strength and precision with premium materials throughout. The receiver is made from 7075-T6 aluminum with a black anodized finish, while the 10.37-inch free-float handguard is machined from 6061-T6 aluminum and combines a full-length Picatinny top rail with Magpul M-LOK attachment slots for flexible accessory mounting. It also includes a patented HMB bolt, Mil-Spec components, charging handle, and a dust cover with an American Flag detail, making it a feature-rich complete upper for AR-15 pistol builds.Product Highlights Complete AR-15 pistol upper chambered for .223 Remington and 5.56x45mm NATO 12.50-inch 4150 chrome moly match grade barrel with Black Cerakote finish and 1:8 twist Integral machined patented gas block with carbine gas system for a streamlined design 10.37-inch free-float handguard with Picatinny rail and Magpul M-LOK compatibility Includes patented HMB bolt, charging handle, Mil-Spec components, and American Flag dust cover Specs Brand: LUXUS ARMS (HM DEFENSE) Manufacturer Part Number: 125MBUP556 UPC: 854164007203 Product Type: Complete upper Platform: AR-15 pistol Caliber: .223 Remington, 5.56x45mm NATO Sights: Optic ready Barrel Length: 12.50 in Barrel Material: 4150 Chromoly Barrel Description: Match grade, tripled honed, button rifled Barrel Finish: Black Cerakote Twist Rate: 1:8 Gas System: Carbine Gas Block: Integral machined patented gas block Receiver Material: 7075-T6 aluminum Receiver Finish: Black anodized Handguard Length: 10.37 in Handguard Type: Free-float Handguard Material: 6061-T6 aluminum Handguard Features: Picatinny rail, Magpul M-LOK Handguard Finish: Black hard coat anodized Included Components: Patented HMB bolt, charging handle, Mil-Spec components, dust cover with 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 product&';s manufacturer.