Rock River Arms .350 Legend Complete Upper - Precision, Power, and Versatility Rock River Arms is renowned for producing high-performance firearms trusted by military, law enforcement, hunters, and shooting enthusiasts alike. This complete AR-15 upper receiver, chambered in .350 Legend, offers a powerful and reliable option for finishing a build or changing calibers with ease. It features a 16" stainless steel barrel with an integrated muzzle brake to reduce recoil and improve control during rapid fire. The lightweight aluminum free-float handguard includes M-LOK slots for easy customization with accessories like bipods, grips, and lights. Complete with a bolt carrier group, charging handle, and magazine, this upper is ready to mount directly onto any standard AR-15 lower receiver-delivering Rock River Arms' trusted quality in a versatile, hard-hitting platform ideal for hunting, target shooting, and more.