Mrp-H Quad 7.62Mm 12.75'' Assembled Upper Receiver

The LMT Defense MRP-H Quad 7.62mm assembled upper receiver is built on LMT's patented Monolithic Rail Platform—a single-piece forged aerospace aluminum design that combines receiver and handguard into one rigid, durable unit. This heavy-profile upper is engineered for shooters who demand precision and modularity in large-caliber rifle builds, whether you're running 7.62×51 NATO, 6.5 Creedmoor, .260 Remington, or other magnum-class cartridges that the LMT system supports.

The MRP-H features a 12.75-inch profile with quad Picatinny rails: 19.25 inches of real estate on the 12 o'clock position and 9-inch sections at 3, 6, and 9 o'clock. That's serious mounting flexibility for optics, night vision, lights, and accessories. The barrel interface uses LMT's proprietary two-lug locking system—accessible from the right side and secured with nothing more than a T-30 Torx wrench. Swap barrels without gunsmithing. The upper comes ready to accept LMT's monolithic barrel assemblies (barrel sold separately) and is compatible with standard AR-platform lower receivers, making it a smart choice for builders who want next-level rigidity without overcomplicating the build.

At 2.116 pounds, the MRP-H is substantial without being excessive, and the integrated design eliminates the flex and tolerance stack-up of traditional two-piece uppers. This is the upper for long-range precision, duty builds, or anyone who refuses to compromise on accuracy foundation.

Key Features

• Monolithic forged aluminum receiver and handguard in one rigid piece
• Quad Picatinny rail configuration with 19.25" of rail space on top and 9" sections on each side
• Proprietary two-lug barrel locking system; tool-free barrel swaps with T-30 Torx bit
• Compatible with 7.62×51 NATO, 6.5 Creedmoor, .260 Remington, .243 Winchester, 7mm-08 Remington, and .338 Federal (with appropriate LMT monolithic barrels)
• Heavy-profile design for maximum rigidity and precision
• Works with standard AR-pattern lower receivers

Specifications

Frequently Asked Questions

What barrels work with the MRP-H Quad upper?

The MRP-H accepts LMT monolithic barrel assemblies chambered in 7.62×51 NATO, .260 Remington, 6.5 Creedmoor, .243 Winchester, 7mm-08 Remington, and .338 Federal. The barrel is not included with this upper and must be purchased separately. The barrel mounts using LMT's proprietary two-lug locking system.

Can I use this upper on a standard AR lower receiver?

Yes. The MRP-H is compatible with standard AR-pattern lower receivers, making it a drop-in upper for traditional AR builds.

How do I change barrels on the MRP-H?

The MRP-H uses a tool-free barrel swap design. Two locking bolts are accessible from the right side of the receiver and are tightened or loosened with a standard T-30 Torx bit. No gunsmith work required.

What rail space does the MRP-H provide?

The quad rail configuration includes 19.25 inches of Picatinny rail on the 12 o'clock (top) position and 9-inch rail sections on the 3, 6, and 9 o'clock positions, giving you extensive mounting options for optics, magnifiers, lights, and other accessories.