Rock River Arms has built a lasting reputation for crafting top-quality firearms trusted by military, law enforcement, hunters and shooting enthusiasts across the board. Their complete upper receivers are an ideal choice for finishing a rifle build project or quickly swapping calibers on your preferred AR-15 platform. This complete upper receiver is chambered in the powerful .458 SOCOM, renowned for its devastating impact. It features a 16 inches chrome moly bull barrel fitted with an RRA Beast Brake, effectively mitigating felt recoil associated with such a potent round. The upper also includes a lightweight 13 inches aluminum free-float handguard with M-LOK slots, allowing seamless attachment of M-LOK compatible accessories such as bipods, foregrips and lights. A full-length picatinny rail atop the receiver provides optimal space for mounting optics or flip-up sights. Complete with a bolt carrier group and charging handle, this upper is ready-to be attached to any standard AR-15 lower receiver, offering both versatility and robust performance in any shooting application.

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It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

Local Law Compliance

Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.