The Rock River Arms tactical carbine complete upper is an A4 configuration chambered in .458 SOCOM, featuring a 16 inches chrome moly bull barrel with a 1,14 twist rate. It includes a complete bolt carrier group, charging handle assembly and a 15 inches RRA lightweight M-LOK compatible free-float rail for easy attachment of accessories such as bipods, foregrips and lights. To manage recoil effectively, it comes equipped with an RRA Operator brake featuring a 5/8-32 thread pitch. This upper provides a robust platform suitable for various shooting applications, combining reliability with the enhanced performance capabilities of the .458 SOCOM cartridge.

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Shipping Restrictions

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.