WORKHORSE® Heavy-duty AR15/M4 Forged Upper Receiver

Heavy-duty forged AR15/M4 upper receiver — precision machined for reliable alignment, rugged service use, and full Mil-Spec compatibility.

Key Features

• Forged from 7075-T6 aircraft-grade aluminum for proven strength and durability
• Precision CNC machined to Mil-Spec dimensions for repeatable upper/lower alignment
• Full-length M1913 Picatinny top rail for optics and iron-sight backup
• Optimized ejection port and feed-ramp interfaces for reliable cycling
• Reinforced barrel extension interface for secure headspacing and alignment
• Prepped for standard charging handle and forward assist (where applicable)
• Type III hard anodize or bead-blast finish options (select in product variants)

Product Overview

The WORKHORSE® AR15/M4 Forged Upper Receiver provides a robust, service-grade platform for duty, competition, or hard-use builds. Forged 7075-T6 construction combined with tight CNC tolerances delivers exceptional strength and repeatability for demanding environments. Designed to accept standard AR15/M4 barrels, handguards, and accessories for straightforward assembly and long-term reliability.

Why Choose WORKHORSE

• Durability: Forged construction resists deformation and handles repeated removals/installs.
• Fit & Repeatability: Tight tolerances reduce play between upper and lower receivers.
• Service Ready: Designed for heavy use with reinforced interfaces and reliable geometry.
• Flexible Options: Available finish and feature variants to suit tactical or show builds.

Specifications

• Model: WORKHORSE® AR15/M4 Forged Upper Receiver
• Material: 7075-T6 Forged Aluminum
• Finish: Type III Hard Anodize / Bead-blast (select in variants)
• Rail: Full-length M1913 Picatinny top rail
• Compatibility: Standard AR15/M4 pattern — accepts Mil-Spec barrels, handguards, and charging handles
• Features: Ejection port, feed-ramp optimized interfaces, forward assist provision (where applicable)
• Weight: Forged design (varies by configuration)
• Country of Origin: USA (replace if needed)
• SKU: WHS-UPR-FRG-SKU (replace)

COMPATIBILITY & FITMENT

Designed to accept standard Mil-Spec AR-15 components (barrels, BCGs, buttstocks, grips). For AR pistol or SBR builds consult a qualified gunsmith and ensure compliance with NFA rules where applicable.

FEDERAL FIREARMS LICENSE REQUIRED

Please provide your FFL dealer information to sales@ravenrockarmory.com immediately after purchase. Orders without valid FFL documentation will be delayed or cancelled.

Fitment & Installation Notes

Built to standard AR15/M4 dimensions. Minor fitting may be required for some proprietary barrels or handguards. If you are not familiar with firearms assembly, we recommend installation by a qualified gunsmith.

Important — Federal Firearms License Required

Note: A valid Federal Firearms License (FFL) transfer is required to purchase and receive this product where applicable. By ordering receivers or other regulated components you agree to follow all local, state, and federal laws. We will only ship to a valid FFL dealer address unless local law permits otherwise.

Ordering & Shipping

• Availability: In stock / backorder (update as appropriate)
• Shipping: Ships to FFL — buyer must provide valid FFL info at checkout
• Returns: Return policy applies to non-serialized parts — contact us before returning

EXPORT NOTICE: This product and/or its components is subject to the Arms Export Control Act (AECA), the Export Administration Act (EAA) as continued in effect under the International Emergency Economic Powers Act (IEEPA), the International Traffic In Arms Regulations (ITAR, 22 CFR Parts 120-130), the Export Administration Regulations (EAR) and the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) Regulations. Export is strictly prohibited without authorization or a license issued by the U.S. Department of State's Directorate of Defense Trade Controls. Any documents, drawings, prints, etc. that can be viewed, downloaded, or printed from our website may contain technical data which may not be exported outside of the United States or released/disclosed to non-US persons (i.e. persons who are not US citizens or lawful permanent residents) inside of the United States, without prior written authorization by the relevant US Government agency. Penalties for violation of U.S. export laws and regulations can reach $1,000,000 per violation and include up to 10 years imprisonment.