The LMT Monolithic Rail Platform (MRP) upper receiver is a groundbreaking innovation in firearm technology, designed for precision and durability. Crafted from a single-piece of forged aerospace-grade aluminum, this upper receiver and handguard combination offers unparalleled strength and stability. The unique design features a proprietary locking system that secures the barrel with two accessible locking bolts, requiring only a standard T-30 Torx bit for installation and maintenance. This ensures a secure fit and easy barrel changes without the need for specialized tools. Specifically engineered for large caliber rifle platforms, the MRP-H QUAD 12-1/2 inches monolithic upper receiver is compatible with a range of calibers, including 7.62x51mm NATO, .243 Winchester, .260 Remington, 6.5 Creedmoor, 7mm-08 Remington and .338 Federal. The receiver's quad rail system provides extensive bipoding options, with a 19-1/4 inches rail at the 12 O'clock position and 9 inches rails at the 3, 6 and 9 O'clock positions, allowing for versatile accessory attachment. This advanced upper receiver requires the patented LMT monolithic barrel assembly, featuring a low-profile gas block and straight gas tube for optimal performance. Please note that the barrel is not included with the upper receiver. The LMT MRP upper receiver is the ideal choice for those seeking a robust, adaptable and high-performance solution for their large caliber rifle needs.

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It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

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.