LMT Defense MRP-H QUAD 7.62mm 12.75" Assembled Upper Receiver

LMT Defense MRP-H QUAD 7.62mm 12.75" Monolithic Assembled Upper Receiver – Quad Rail

The LMT Defense MRP-H QUAD Monolithic Upper Receiver is a purpose-built platform engineered for large-frame precision and durability. Designed around LMT’s patented Monolithic Rail Platform (MRP™) architecture, the receiver and handguard are machined from a single piece of forged aerospace-grade aluminum, creating an incredibly rigid and durable upper receiver system. This monolithic design eliminates traditional handguard flex and ensures excellent repeatability for optics, lasers, and accessories mounted across the continuous top rail.

At the core of the MRP system is LMT’s quick-change barrel interface, allowing shooters to swap calibers or barrel lengths quickly using only a standard T-30 Torx wrench. Two locking bolts secure the barrel assembly from the right side of the receiver, providing a rock-solid interface that maintains consistent alignment and accuracy. This system requires LMT’s proprietary monolithic barrel assemblies, which feature a low-profile gas block and straight gas tube optimized for the MRP platform.

The MRP-H QUAD 12.75 upper features a full quad-rail configuration for maximum accessory flexibility. A continuous 19.25-inch 12 o’clock rail allows seamless mounting of optics, night vision devices, and backup sights, while 9-inch rails at the 3, 6, and 9 o’clock positions provide ample space for lights, grips, bipods, lasers, and other mission-critical accessories.

Built for large-caliber performance, this platform supports a wide range of cartridges including 7.62×51 NATO (.308 Win), .243 Winchester, .260 Remington, 6.5 Creedmoor, 7mm-08 Remington, and .338 Federal when paired with the appropriate LMT barrel assembly. Whether configured as a precision rifle, battle rifle, or suppressed long-range platform, the MRP-H offers unmatched modularity and strength.

The LMT MRP-H QUAD upper receiver delivers the durability, modularity, and precision expected from one of the most respected names in modern rifle manufacturing.

Now available at BattleHawk Armory.

Specifications

• Manufacturer: LMT Defense

• Platform: MRP-H (Large Frame)

• Caliber Compatibility:

  • 7.62×51 NATO / .308 Win

  • .243 Winchester

  • .260 Remington

  • 6.5 Creedmoor

  • 7mm-08 Remington

  • .338 Federal

• Rail Type: Quad Rail

• Top Rail Length: 19.25"

• Side/Bottom Rail Length: 9" (3, 6, and 9 o’clock)

• Material: Forged Aerospace Aluminum (Monolithic Construction)

• Barrel System: LMT Quick-Change Monolithic Barrel Interface

• Required Tool: T-30 Torx Bit

• Weight: 2.116 lbs

• Overall Length: 19.25"

• Barrel Included: No

• BCG / Charging Included: No