Product DescriptionThe Battle Arms Development WORKHORSE upper receiver assembly is a durable, do-it-all AR-15 upper built around a 16-inch 5.56 NATO barrel and a mid-length gas system for balanced reliability and shootability. It features an A2-profile 4150 chrome-moly vanadium (CMV) barrel with a nitride finish and a fast 1:7 twist rate, paired with a free-float M-LOK handguard for mounting lights, grips, and other accessories. This configuration ships without a bolt carrier group (BCG) or charging handle, letting you select the components that best match your build.Product Highlights 16" A2-profile 5.56 NATO barrel with 1:7 twist for excellent performance with heavier projectiles Mid-length gas system designed to balance reliability and recoil impulse 4150 chrome-moly vanadium barrel steel with a nitride finish for wear and corrosion resistance Free-float WORKHORSE M-LOK handguard provides versatile accessory mounting Includes A2 flash hider on standard 1/2-28 muzzle threads; does not include BCG or charging handleSpecs Brand: Battle Arms Development Model: WORKHORSE Type: AR-15 Upper Receiver Assembly Chamber: 5.56 NATO Barrel Length: 16 in Barrel Profile: A2 Barrel Steel: 4150 Chrome-Moly Vanadium Barrel Finish: Nitride Chrome Lining: None Twist Rate: 1:7 Gas System: Mid-length Muzzle Threads: 1/2-28 Muzzle Device: A2 Flash Hider Handguard: 15 in WORKHORSE M-LOK Free Float Included Components: Upper assembly only (no bolt carrier group or charging handle) Manufacturer Part Number: WH-UR-16-556 UPC: 810033784095Disclaimer: 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.