Global Ordnance Monolithic AR-15 Upper 5.56 NATO 12.5" M-LOK

The Global Ordnance Monolithic Upper Assembly delivers enhanced accuracy and modularity for AR-15 platforms through its one-piece receiver and handguard design. This 5.56 NATO chambered upper eliminates potential flex points found in traditional two-piece systems, providing a rock-solid foundation for optics and accessories.

What Makes This Different

The monolithic construction creates a continuous Picatinny rail from receiver to handguard, ensuring consistent zero retention across multiple shooting sessions. Unlike standard uppers that rely on barrel nut interfaces, this design machines the handguard and receiver from a single piece of aluminum. The 12.5-inch barrel length strikes an optimal balance between velocity retention and maneuverability, making it 2 inches shorter than standard carbine configurations while maintaining effective terminal ballistics out to 300 yards.

Key Features

• Monolithic aluminum construction eliminates receiver-to-handguard joint flex
• 12.5-inch chrome-lined barrel optimized for 5.56 NATO and .223 Remington
• M-LOK attachment system provides 360-degree accessory mounting options
• Continuous Picatinny rail extends full length for optics and backup sights
• Black polymer pistol grip included with ergonomic texturing
• Standard AR-15 bolt carrier group and charging handle compatibility
• Mil-spec dimensions ensure compatibility with all AR-15 lower receivers

This upper assembly excels in close-quarters applications where rapid target acquisition matters most. The 12.5-inch barrel generates approximately 2,850 fps with 55-grain ammunition while remaining compact enough for vehicle operations or confined spaces. Law enforcement and competitive shooters benefit from the enhanced rigidity when mounting lights, lasers, and vertical grips. The M-LOK slots reduce overall weight compared to quad-rail systems while maintaining strength under stress.

Technical Specs

• Caliber: 5.56 NATO/.223 Remington
• Barrel Length: 12.5 inches
• Overall Length: Approximately 19.5 inches
• Weight: 3.2 pounds (without BCG/charging handle)
• Material: 7075-T6 aluminum receiver and handguard
• Finish: Type III hard coat anodized black
• Thread Pitch: 1/2x28 TPI
• Gas System: Carbine length
• Handguard: M-LOK compatible with continuous top rail

This monolithic upper assembly represents a significant upgrade for shooters demanding maximum accuracy potential from their AR-15 platform. The precision machining and robust construction justify the investment for serious applications. Current inventory levels make immediate shipping possible for qualified purchasers.