Solgw M4-exo3 16" 5.56 Urg

The Sons of Liberty Gun Works M4-exo3 16" 5.56 URG (upper receiver group) delivers precision-engineered performance built for operators and serious shooters who demand reliability in tactical and training environments. This 16-inch upper receiver group is optimized for the 5.56 NATO/.223 Remington cartridge, offering a compact platform that balances velocity, handling, and modularity. Weighing 4.06 lbs, the exo3 provides a lightweight solution for carbine builds where every ounce matters in extended operations or patrol scenarios.

The 16-inch barrel length is the industry standard for M4-pattern carbines, delivering sufficient velocity from 5.56 ammunition while maintaining overall compactness for vehicle operations, close-quarters training, and rapid target engagement. Sons of Liberty Gun Works is known for precision manufacturing and attention to component quality, making the exo3 a dependable choice for builders seeking a complete, ready-to-assemble upper receiver. The design integrates seamlessly with standard M4 lower receivers, allowing users to complete their build with aftermarket stocks, triggers, and controls matched to their specific mission profile.

This upper receiver group suits law enforcement entry teams, military personnel, civilian tactical trainers, and AR platform enthusiasts building dedicated 5.56 rifles. The modular AR-15 platform allows shooters to customize ergonomics, optics mounting, and charging handle placement without replacing the upper itself. The 5.56 cartridge remains the standard intermediate round across tactical applications, offering manageable recoil, proven reliability, and availability of ammunition across training and duty scenarios. Whether configured for home defense, competition prep, or professional duty, the exo3 16" upper provides a foundation for a purpose-built carbine system.