The LMT Defense MRP-H M-LOK 7.62mm 15.3" Assembled Upper Receiver brings the company’s patented Monolithic Rail Platform to large-caliber rifle builds. Machined from a single piece of aerospace-grade aluminum, it integrates the receiver and extended M-LOK handguard for exceptional rigidity and a continuous top rail. A proprietary barrel locking system with two bolts on the right side allows quick barrel changes using only a standard T-30 Torx bit, while remaining secure under hard use.

This upper is purpose-built for the LMT MWS platform and accepts compatible monolithic barrel assemblies in 7.62x51 NATO, .243 Winchester, .260 Remington, 6.5 Creedmoor, 7mm-08 Remington, and .338 Federal. With its 15.3" handguard length and generous M-LOK slots on all eight sides, it offers ample space for lights, bipods, and other accessories, making it well suited for precision range work, competition, and training-focused rifle setups. The design reflects LMT Defense’s reputation for thoughtful engineering, durable construction, and user-focused innovation.

• Manufacturer: LMT Defense
• Model: MRP-H M-LOK 7.62mm 15.3" Assembled Upper Receiver
• Caliber: 7.62x51 NATO (compatible with .243 Winchester, .260 Remington, 6.5 Creedmoor, 7mm-08 Remington, .338 Federal)
• Attachment Type: M-LOK
• Material: Aerospace-Grade Aluminum Monolithic Receiver And Handguard
• Handguard Length: 15.3"
• Receiver Platform: LMT MWS / MRP-H (Heavy)