The groundbreaking MCR (Mission Configurable Rifle) belt-fed upper receiver assembly revolutionizes the AR/M4 platform by seamlessly integrating with any MIL-Spec lower receiver without permanent modifications. Rearward compatible with AR-15/M16 models dating back to 1963, this innovative system allows users to transform their rifle in seconds without the need for tools, adapting effortlessly to any mission profile. Engineered for responsible armed citizens, law enforcement, and professional security personnel, the MCR enhances performance with a gas-piston operation for extreme reliability in adverse conditions. Its 16.25 inches quick-change barrel system enables rapid barrel swaps in just three seconds, while the M-LOK co-planar handguard provides a secure platform for mounting optics and modern accessories. Offering unparalleled versatility, the MCR functions as both an optic-ready carbine and a lightweight support rifle, accepting standard AR-15/M16 box magazines or M27 linked ammunition for exceptional firepower and adaptability.

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
The 16-1/4 inches quick-change barrel allows for easy swapping without tools
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
Dual feed accepts all AR-15/M16 magazines and M27 linked ammunition, offering exceptional versatility for rapid and efficient reloading
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 includes manganese phosphate and type III, class 2 hard coat anodize black for maximum corrosion and wear resistance, ensuring longevity and resilience in harsh environments
The full-auto bolt carrier ensures reliable and smooth cycling, providing a consistent shooting experience for those using automatic firing modes
The handguard style features a MIL-STD-1913 rail at the 12 o'clock position and M-LOK slots at the 3, 6 and 9 o'clock positions, offering versatile accessory mounting options
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.