F1 Firearms UDR-15 3G Style 1 Universal Black Upper/Lower Rifle Receiver Set

Industry-Leading Billet Construction

The F1 Firearms UDR-15 3G Style 1 Universal Receiver Set is CNC machined from premium 7075-T6 aircraft-grade billet aluminum, offering unmatched tensile strength, rigidity, and durability. This superior material choice ensures the receiver can withstand the stresses of high-round counts and harsh environments while remaining corrosion resistant. Each set undergoes precise machining to maintain tight tolerances and a flawless fit, delivering a foundation for any custom AR-15 build that demands both reliability and precision.

Advanced 3G Skeletonized Design

F1 Firearms’ proprietary 3G skeletonizing process removes unnecessary material without compromising structural integrity. Strategic scallops and cut-outs reduce weight by up to 30% compared to traditional mil-spec receivers, enhancing maneuverability and reducing user fatigue. The open-frame look not only provides a modern aesthetic but also aids in heat dissipation during rapid-fire or extended shooting sessions.

Scalloped MIL-SPEC Picatinny Rail System

The top rail features a scalloped MIL-SPEC 1913 Picatinny design, allowing for quick-attachment of optics, sights, and accessories. The scalloped profile offers reduced weight and an aggressive look, while full-length rails ensure compatibility with a wide range of scopes, red dot sights, backup iron sights, and other tactical accessories.

Enhanced Ergonomics and Loader Efficiency

An oversized trigger guard provides ample clearance for gloved or bare-handed use, improving comfort and safety. The 60-degree beveled magazine well accelerates reloads and ensures positive magazine seating under stress, making this receiver set ideal for competition shooters, law enforcement, and operators who demand rapid, reliable magazine changes.

Complete Hardware Package

Every F1 Firearms UDR-15 3G Style 1 set ships with front and rear takedown pins pre-installed, as well as screws for bolt catch assembly, receiver tensioning, and trigger adjustment. This drop-in-ready approach simplifies build time and eliminates the need to source additional pins or detents, streamlining your assembly process.

Type III Class 2 Hard Anodized Finish

The black Type III Class 2 hard-coat anodized finish meets MIL-A-8625 specifications, providing a dense oxide layer that delivers superior wear resistance, corrosion protection, and a sleek tactical appearance. This finish stands up to harsh cleaning solvents, heavy use, and environmental exposure without chipping or fading.

Universal Compatibility and Modularity

True to its name, the Universal Receiver Set is engineered to accept a broad range of AR-15 lower and upper components. Whether you’re installing aftermarket barrel nuts, handguards, or stocks, the precise machining and MIL-SPEC dimensions ensure a rock-solid fit and consistent alignment, guaranteeing peak performance with any compatible AR accessory.

Precision Manufacturing and Quality Control

At the heart of every UDR-15 3G Style 1 is rigorous quality assurance. Each receiver is inspected and measured using coordinate measuring machines (CMM) to confirm that all critical dimensions meet or exceed spec. F1 Firearms also performs proof testing to verify material integrity and dimensional accuracy, ensuring that every unit shipped maintains the brand’s legendary reputation for excellence.

Ideal for Tactical, Competition, and Recreational Use

Whether building a competition-grade rifle, a duty carbine, or a reliable range toy, the UDR-15 3G Style 1 receiver set adapts to any role. The combination of lightweight construction, precision machining, and user-friendly features makes this the go-to choice for professionals, hobbyists, hunters, and competitors seeking a high-performance platform.

Installation and Maintenance Guidelines

Installation follows standard AR-15 assembly procedures. Carefully torque barrel nuts and castle nuts to mil-spec values, apply high-quality lubricant at all pivot and detent contact points, and verify proper function of the bolt catch and trigger group. Routine disassembly, cleaning, and inspection will preserve the anodized finish and ensure the long-term reliability of your build.

Conclusion: Elevate Your AR-15 Build

The F1 Firearms UDR-15 3G Style 1 Universal Black Upper/Lower Receiver Set embodies the pinnacle of modern AR platform design. From the rugged strength of 7075-T6 billet aluminum to the weight-saving skeletonized architecture and MIL-SPEC hard anodized finish, every detail is optimized for durability, performance, and modularity. Upgrade your next build with F1 Firearms and experience the difference that precision engineering and advanced materials can make.

• Action: Semi Automatic
• Finish: Anodized (Type III Class 2 Hard Coat)
• Gun Model: UDR-15
• Material: High-grade 7075-T6 Billet Aluminum
• Trigger Guard: Oversized for Gloved Use
• Magazine Well: 60° Beveled
• Rail: Scalloped MIL-SPEC 1913 Picatinny
• Includes: Front & Rear Takedown Pins, Bolt Catch & Detent Screws