LMT MRP-L MLOK | 11.5 Specwar Upper Receiver

The LMT MRP-L MLOK 11.5 Specwar Upper Receiver is designed for AR-15 platforms chambered in 5.56×45 NATO and .300 Blackout when paired with a compatible LMT barrel assembly. Built on LMT’s Monolithic Rail Platform (MRP™), the receiver and handguard are machined from a single piece of aerospace-grade aluminum, providing a rigid structure for mounting optics and accessories. The proprietary quick-change barrel system uses two locking bolts, allowing barrel installation or removal with a standard T-30 Torx tool.

This upper features an extended M-LOK® handguard with a continuous top Picatinny rail, offering increased space for accessory mounting. The design supports compatibility with barrels approximately 12 inches or longer, including LMT monolithic barrel assemblies with low-profile gas systems. A rear QD sling attachment point is included, while the streamlined handguard omits forward QD mounts. The upper receiver is sold without a barrel, allowing users to configure their setup based on caliber and intended use.

Specifications

• Caliber Compatibility: 5.56×45 NATO, .300 Blackout (with compatible barrel)
• Construction: Monolithic aerospace-grade aluminum receiver and handguard
• Barrel System: Proprietary LMT quick-change barrel system (barrel not included)
• Handguard Length: 11.5 inches
• Mounting Interface: M-LOK® attachment system
• Top Rail: Continuous Picatinny rail
• Sling Mounts: Rear QD sling attachment point
• Tool Requirement: T-30 Torx wrench for barrel installation
• Barrel Compatibility: LMT monolithic barrel assemblies only
• Recommended Barrel Lengths: Approx. 12 inches or longer