The Rock River Arms CMPLT CAR A4 UPR 350LGD 16" 10RD presents a ready-to-use Tactical Carbine complete upper receiver crafted for AR-15 platforms, delivering precision and reliability in a black anodized finish. This 16" upper is chambered in 350 Legend and pairs a rugged RRA Operator Muzzle Brake with a 13" free-float M-LOK handguard, providing clean handling, enhanced control, and versatile accessory attachment for fast, on-target engagements. Included are a complete upper receiver, bolt carrier group, and charging handle assembly, ensuring a straightforward install and smooth cycling right out of the box. The anodized black finish not only guards against wear but also adds a low-reflectivity profile suited for serious field use. Designed to fit AR-15 receivers, it comes with a 10-round capacity and a single magazine, making it an ideal upgrade for hunters and sport shooters seeking a compact, full-featured upper that balances performance with maneuverability. With Rock River Arms commitment to quality, this complete upper delivers dependable reliability, precise barrel performance, and a streamlined configuration for rapid deployment in 350 Legend applications.