Product DescriptionThe Noveske N4 SPR Complete Upper Receiver is built for shooters who want precision-oriented AR-15 performance in 6mm ARC. This upper features an 18-inch 416R stainless steel barrel with a 1:7 twist and 3-land-and-groove rifling, making it well suited for accuracy-focused applications. A hand-polished Noveske Match Chamber and extended hand-polished feed ramps help promote reliable feeding and consistent performance. The rifle-length gas system is paired with a pinned low-profile gas block for dependable operation, while the 5/8x24 threaded muzzle is fitted with a Noveske Pig Pen suppressor-compatible muzzle device.This complete upper also includes a 4th-generation billet 7075-T6 aluminum upper receiver, a Noveske Love Handle ambidextrous charging handle, and a 15-inch NSR free-floating M-LOK handguard with a continuous Picatinny top rail for accessories and optics. Additional premium details include a full-auto bolt carrier group and a DLC-coated Noveske bolt. Finished in black, this upper receiver assembly is designed to deliver premium fit, function, and accuracy for demanding AR-platform builds.Product Highlights Chambered in 6mm ARC with an 18-inch 416R stainless steel precision barrel for accuracy-focused shooting. Features a 1:7 twist, 3-land-and-groove rifling, and a hand-polished Noveske Match Chamber for enhanced performance. Includes a rifle-length gas system with pinned low-profile gas block for reliable cycling and durability. Equipped with a 15-inch NSR free-floating M-LOK handguard and continuous Picatinny top rail for versatile accessory mounting. Built with premium Noveske components including a Gen 4 billet upper receiver, ambidextrous Love Handle charging handle, full-auto bolt carrier group, and DLC-coated bolt. Specs Brand: Noveske Manufacturer Part Number: 03002559 UPC: 840906136027 Product Type: Complete Upper Receiver Assembly Platform Fit: AR-15 Model: N4 SPR Caliber: 6mm ARC Barrel Length: 18 inches Barrel Material: 416R Stainless Steel Twist Rate: 1:7 Rifling: 3-Land-and-Groove Gas System: Rifle-Length Gas Block: Pinned Low-Profile Gas Block Thread Pitch: 5/8x24 Muzzle Device: Noveske Pig Pen Suppressor-Compatible Muzzle Device Receiver Material: Billet 7075-T6 Aluminum Receiver Generation: Gen 4 Handguard Length: 15 inches Handguard Type: NSR Free-Floating M-LOK Top Rail: Continuous Picatinny Rail Charging Handle: Noveske Love Handle, Ambidextrous Bolt Carrier Group: Full-Auto Bolt Finish: DLC Coated Color: Black Finish: Cerakote 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.