LMT MRP-L Hybrid | 9.25 Grenadier Upper Receiver

The LMT MRP-L Hybrid 9.25 “Grenadier” Upper Receiver is designed for AR-15 platforms and supports both direct impingement (DI) and piston-driven barrel systems when paired with compatible LMT monolithic barrels. Built on LMT’s Monolithic Rail Platform (MRP™), the receiver and handguard are machined from a single piece of forged aerospace-grade aluminum, providing a rigid structure for mounting optics and accessories. The proprietary quick-change barrel system uses two locking bolts, allowing installation or removal with a standard T-30 Torx tool.

This hybrid configuration features a combination of M-LOK® attachment points and integrated Picatinny rail sections for flexible accessory mounting. A full-length Picatinny rail at the 6 o’clock position supports compatibility with rail-mounted accessories, while shorter rail sections at the 3 and 9 o’clock positions offer additional mounting options. Integrated QD sling sockets are located at the rear of the handguard. The upper receiver is sold without a barrel, allowing users to configure their setup based on caliber and application requirements.

Specifications

• Color: Black
• Caliber Compatibility: Varies by installed LMT barrel (5.56 NATO, .300 BLK, etc.)
• Construction: Monolithic forged aerospace-grade aluminum receiver and handguard
• Barrel System: Proprietary LMT quick-change barrel system (barrel not included)
• Handguard Length: 9.25 inches
• Mounting Interface: Hybrid (M-LOK® and Picatinny rail sections)
• Bottom Rail: Full-length 1913 Picatinny rail (6 o’clock)
• Side Rails: Short Picatinny sections (3 and 9 o’clock)
• Sling Mounts: Integrated QD sling sockets (rear)
• Tool Requirement: T-30 Torx wrench for barrel installation
• Barrel Compatibility: LMT monolithic barrel assemblies only
• System Compatibility: Supports both DI and piston barrel configurations