Product Description The Rock River Arms LAR-15M CLB Complete Upper is built to bring hard-hitting .458 SOCOM performance to your AR-15 platform. It features a forged A4 upper receiver paired with a 16-inch chrome moly bull barrel and a low profile gas block for a clean, modern setup. Up front, the RRA Beast Brake with 5/8x32 threads helps manage recoil, while the 13-inch extended-length lightweight aluminum free float handguard provides M-LOK compatibility for accessories. This complete upper includes a bolt carrier group and charging handle assembly, making it a convenient upgrade for your build. Product Highlights Chambered in .458 SOCOM with a 16-inch chrome moly bull barrel for powerful AR-15 performance Forged A4 upper receiver with black finish for a durable, streamlined build RRA Beast Brake muzzle device (5/8x32 thread) to help reduce recoil and muzzle rise 13-inch extended-length lightweight aluminum free float rail with M-LOK compatibility Includes bolt carrier group and charging handle assembly for a true complete upper setup Specs Brand: Rock River Arms Manufacturer Part Number: SOC0820V1 UPC: 842834101306 Platform Fit: AR-15 Caliber/Chamber: .458 SOCOM Upper Receiver: Forged A4 Receiver Material: Aluminum Barrel Length: 16 inches Barrel Material: Chrome moly Barrel Profile: Bull barrel Twist Rate: 1:14 Gas Block: Low profile Handguard: RRA lightweight aluminum free float rail, 13-inch extended length, M-LOK compatible Muzzle Device: RRA Beast Brake Muzzle Thread: 5/8x32 Includes: Bolt carrier group and charging handle assembly Color: Black 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.