Sons Of Liberty Gun Works M4-EXO3 5.56 AR-15 Barreled Upper Receiver Group - 13.7" - EXO3UPPER-13.7-556

Elevate your AR-15 build with the Sons Of Liberty Gun Works M4-EXO3 5.56 Barreled Upper Receiver Group, engineered for unmatched reliability and performance in demanding conditions. This 13.7-inch upper delivers the perfect balance of maneuverability and ballistic efficiency, making it an ideal choice for tactical enthusiasts, competitive shooters, and home defenders seeking a duty-grade component that stands up to rigorous use.

Key Features

• Liberty Fighting Barrel: Crafted from high-quality 4150 CMV steel with a durable Nitride/Melonite QPQ finish for superior corrosion resistance and extended barrel life.
• EXO3 Handguard: Third-generation 13-inch M-LOK rail with 7-sided slots for versatile accessory mounting, anti-rotation tabs, and optimized weight distribution to enhance handling and reduce fatigue during extended sessions.
• Forged Upper Receiver: Mil-spec 7075-T6 aluminum construction with M4 feed ramps for smooth feeding and enhanced durability under high-round counts.

Technical Specifications

• Caliber: 5.56 NATO
• Barrel Length: 13.7 inches
• Gas System: Mid-length for reduced recoil and improved reliability across various ammunition types
• Twist Rate: 1:7 RH, optimized for stabilizing heavier bullets ideal for modern defensive loads
• Barrel Profile: Government/SOCOM hybrid for balanced weight and heat dissipation
• Gas Block: 4140 V2 low-profile, set screw design for precise gas control
• Weight: Approximately 60.96 oz (without BCG or charging handle)
• BCG/Charging Handle: Not included – customize with your preferred components for a tailored fit

Why Choose the M4-EXO3 Upper?

This upper addresses common pain points in AR-15 builds by providing a rigid, lightweight platform that enhances accuracy and control without compromising on strength. The mid-length gas system softens felt recoil, allowing for faster follow-up shots, while the EXO3 rail’s modular design lets you attach optics, lights, and grips exactly where needed. Built to SOLGW’s rigorous standards, it ensures consistent performance whether you’re training at the range, competing, or preparing for real-world scenarios – all backed by precision engineering that minimizes flex and maximizes barrel harmonics for tighter groups.

Ready to upgrade your rifle with a component trusted by professionals? The M4-EXO3 delivers the reliability and versatility you demand – complete your build today and experience the difference quality makes.