The MCR (Mission Configurable Rifle) belt-fed upper receiver assembly redefines versatility and performance, offering seamless compatibility with standard AR/M4-type uppers. Engineered for effortless integration, it fits any MIL-Spec lower receiver without requiring permanent modifications and remains fully backward compatible with AR-15 and M16 models dating back to 1963. Designed to enhance firepower without sacrificing adaptability, this innovative system allows users to reconfigure their rifle in seconds without tools, making it an ideal solution for a wide range of mission profiles. Built for responsible armed citizens, law enforcement, and professional security personnel, the patented MCR upper receiver system delivers a superior combination of reliability, durability, and flexibility. Its gas-piston operation ensures exceptional performance in the harshest conditions, providing smooth, clean cycling for enhanced long-term dependability. The 12.5 inches quick-change barrel system allows for rapid swaps in just three seconds, offering mission-specific adaptability with minimal downtime. Equipped with a MIL-STD 1913 co-planar handguard featuring an integrated rail-interface system, the MCR provides a rock-solid platform for optics and modern accessories, allowing for maximum customization to suit any operational need. Spanning the full spectrum of capabilities from an optic-ready carbine to a lightweight support rifle, the MCR offers an unparalleled level of firepower and flexibility. It seamlessly accommodates both standard AR-15/M16 box magazines and M27 linked ammunition, giving operators the ability to switch between feeding systems based on mission demands. Whether for tactical applications, duty use, or defensive scenarios, the MCR delivers a cutting-edge solution for those who demand peak performance, adaptability, and uncompromising firepower.

Drop-on upper receiver assembly is designed to upgrade your AR-15/M16/M4 lower receivers or rifles, providing an easy installation for improved functionality
The 5.56 x 45mm round offers versatility and reliability in a variety of firearms
This 12-1/2 inches barrel is designed for quick-change functionality
Features a 1:7 inches RHT, 1/2-28 TPI
Short-stroke gas piston operation, providing enhanced reliability and reduced fouling compared to traditional direct impingement systems, ensuring smooth operation
The dual feed accepts all AR-15/M16 magazines and M27 linked ammunition, offering versatile compatibility for various firearm platforms
Precision-machined 7075-T6 billet upper receiver, feed cover and charging handle, providing maximum durability and performance for your firearm
Precision-machined billet steel feed tray, ensuring high-strength and reliability for the feeding system
The finish is manganese phosphate and type III, class 2 hard coat anodize black, offering superior durability and protection against corrosion and wear in demanding conditions
The full-auto bolt carrier ensures reliable and smooth cycling, providing a consistent shooting experience for those using automatic firing modes
The handguard style follows the MIL-STD-1913 rail design, offering a robust mounting platform for optics, lights and other accessories for enhanced firearm versatility
Adjustable sight set allows for fine-tuning sighting system for increased accuracy
Quick-change barrel handle, enabling fast and efficient barrel swaps with minimal effort
Ships with main action spring, bolt catch, carbine stock spacer, (100) M27 links and operator's manual, offering essential parts for assembling and maintaining the firearm system
Made in the USA, this product is built with quality standards, reflecting excellence in American manufacturing

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All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

Local Law Compliance

Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.