The Workhorse complete upper receiver is precision-engineered for superior performance and reliability, featuring a forged Workhorse 7075-T6 aircraft-grade aluminum receiver. It is equipped with a free-float rail handguard, providing M-LOK attachment points at the 3, 6 and 9 o'clock positions for a wide range of accessory options. At the 12 o'clock position, the full-length picatinny accessory rail with a signature notch cut is perfectly aligned with the upper receiver for seamless integration of additional gear. Each upper receiver is outfitted with a 4150 chrome-moly steel black nitride barrel, delivering outstanding durability and exceptional accuracy. The barrel is individually head-spaced and paired with a matching 9310 steel bolt and 8620 black nitride carrier, ensuring unmatched reliability, smooth function and easy cleaning. Designed to meet the demands of serious shooters, the Workhorse upper receiver combines durability, precision and ease of maintenance for the ultimate shooting experience.

Includes a 10-1/2 inches barrel
The Bad Rack-15 ambidextrous charging handle allows for smooth and easy manipulation from either side of the firearm
Nitride finish, AR-15/M16 Bolt Carrier Group, providing increased performance and longevity with enhanced protection against wear
The free-float M-LOK handguard allows for free-floating barrel integration, ensuring accuracy and reducing the risk of barrel deflection during use
Anodized finish in sniper gray provides a matte, durable finish ideal for tactical environments

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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.