LMT MRP-L M-LOK Grenadier Monolithic Upper Receiver - 9.25"

New for 2026 — the LMT MRP-L M-LOK Grenadier takes the patented MRP-L monolithic upper platform and adds a full 6 o'clock Picatinny rail for direct launcher and accessory mounting, while retaining the T-30 Torx quick-change barrel system compatible with 10.5" to 16" LMT barrel assemblies.

The LMT MRP-L M-LOK Grenadier 9.25" Monolithic Upper Receiver is a carbine-length one-piece forged aluminum upper receiver and handguard for AR-15 piston and DI builds, featuring M-LOK attachment points, short Picatinny sections at 3 and 9 o'clock, a full 6 o'clock Picatinny rail, and integrated QD sockets at the aft end of the handguard.

The full 6 o'clock Picatinny rail is the defining feature of the Grenadier configuration — allowing direct mounting of any LMT 1913-compatible launcher and rail-mounted accessories below the handguard without additional adapters. Like the Hybrid, the monolithic one-piece construction provides maximum rigidity, and barrel changes require only a T-30 Torx bit for the two receiver bolts. Integrated QD sockets at the aft end of the handguard provide sling attachment without added hardware.

• Platform: MRP-L (Light)
• Construction: Single-piece forged aerospace aluminum (receiver and handguard)
• Handguard Length: 9.25"
• Attachment Interface: M-LOK with Picatinny at 3 and 9 o'clock; full Picatinny rail at 6 o'clock
• QD Sockets: Integrated (aft end of handguard)
• Barrel Compatibility: 10.5" to 16" LMT monolithic barrel assemblies
• Gas System Compatibility: Piston and Direct Impingement
• Barrel Change Tool: T-30 Torx bit (standard)
• Color: Black
• Barrel: Not included
• New for 2026

Compatibility Note: This receiver is only compatible with LMT patented monolithic barrel assemblies that feature a low-profile gas block with straight gas tube. Standard AR-15 barrels and standard barrel nut systems are not compatible. Accepts LMT barrel assemblies from 10.5" to 16". Compatible with mil-spec AR-15 lowers. Barrel is not included and must be purchased separately.

Single-piece forged aerospace aluminum construction for maximum rigidity and consistent zero retention across barrel changes and sustained fire — with the added versatility of a full underbarrel Picatinny rail.

Ideal for operators who need under-barrel launcher capability, builds requiring full bottom rail access for accessories, and configurations that benefit from MRP-L monolithic rigidity with quick-change barrel flexibility.

Lewis Machine and Tool (LMT) is a U.S. military and law enforcement supplier known for precision manufacturing and their patented MRP barrel system, with decades of deployment history worldwide.