Product Description The Rock River Arms CAR A4 Complete Upper Receiver is chambered in .350 Legend and built for shooters who demand reliability, precision, and versatility from their AR-15 platform. This complete upper features a 16-inch chrome moly steel barrel with a 1:16 twist rate, threaded at 1/2-36 TPI and fitted with the RRA Operator Muzzle Brake to reduce felt recoil and improve follow-up shot accuracy. The forged aluminum A4 flat-top upper receiver pairs with an RRA 13-inch Extended Lightweight Free Float M-LOK Handguard, offering a full-length Picatinny top rail and M-LOK accessory slots along the handguard for bipods, foregrips, lights, and more. A low-profile gas block and carbine-length gas system round out the reliable operating package. Delivered ready to mount on any mil-spec AR-15 lower receiver, this upper includes a bolt carrier group, charging handle assembly, and one 10-round magazine, making it an outstanding option for completing a build or swapping calibers with ease. Product Highlights .350 Legend Chambering: Versatile and hard-hitting cartridge ideal for hunting and range shooting, compatible with standard AR-15 lower receivers. 16" Chrome Moly Barrel: 1:16 twist rate barrel delivers consistent accuracy and durability with the RRA Operator Muzzle Brake (1/2-36 thread) for recoil reduction. RRA 13" Extended Lightweight Free Float M-LOK Handguard: Aluminum free-float design with M-LOK slots and full-length Picatinny top rail for easy accessory customization. Complete Ready-to-Attach Package: Includes bolt carrier group, mil-spec charging handle assembly, and one 10-round magazine for immediate use. Forged Aluminum A4 Flat-Top Upper Receiver: Matte black anodized finish, carbine-length gas system with low-profile gas block, fits mil-spec AR-15 lower receivers. Specs Brand: Rock River Arms Manufacturer Part Number (MPN): 350L0328 UPC: 842834124589 Caliber: .350 Legend Barrel Length: 16 inches Barrel Material: Chrome Moly Steel Twist Rate: 1:16 Muzzle Device: RRA Operator Muzzle Brake, 1/2-36 Thread Gas System: Carbine Length with Low Profile Gas Block Upper Receiver: Forged Aluminum A4 Flat Top Handguard: RRA 13" Extended Lightweight Free Float M-LOK Rail: Full Length Picatinny Top Rail Finish: Matte Black Anodized Includes: Bolt Carrier Group, Charging Handle Assembly, (1) 10-Round Magazine Compatible With: Mil-Spec AR-15 Lower Receivers 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. ]]>