The LMT MRP-L M-LOK 11.5-inch SPECWAR upper receiver (LMT part no. R-L7Z1A) was designed with specialized warfighters in mind. It is built to use the 12.5-inch MRP barrel as well as other barrels of 12 inches or more. LMT removed the built-in forward QD swivels and extended the length over the traditional CQB upper to improve ergonomics and accessory space. The receiver and handguard are machined from a single piece of aerospace-grade aluminum, so the platform stays rigid for lasers and lights. An M-LOK rail and continuous Picatinny top rail handle the mounting.

Key Specifications

• The platform is MRP-L (Light), LMT’s lighter monolithic rail platform.
• Supported calibers are 5.56×45 and .300 BLK.
• The rail system is M-LOK, for modular accessory mounting.
• A continuous Picatinny top rail runs the length of the upper for optics.
• The receiver and handguard are one piece of aerospace-grade aluminum, for a rigid platform.
• The barrel is held by a proprietary locking system with two bolts accessible from the right side.
• Barrel installation needs only a T-30 Torx bit to tighten the locking bolts.
• It requires the patented LMT monolithic barrel assembly with a low-profile gas block and straight gas tube.
• It uses the 12.5-inch MRP barrel or other barrels of 12 inches or more.
• A single QD sling point sits at the aft of the receiver, and the forward QD swivels are removed.

Frequently Asked Questions

What barrels does the SPECWAR upper use? It is built to use the new 12.5-inch MRP barrel as well as other 12-inch or longer barrels, and it requires the patented LMT monolithic barrel assembly.

What tool installs the barrel? The barrel is held by two locking bolts accessible from the right side, and a standard T-30 Torx bit is the only tool needed to tighten them.

Is there a sling attachment point? Yes. A single QD sling point is available in the aft portion of the receiver.

Buy the LMT MRP-L M-LOK 11.5-Inch SPECWAR Upper Receiver

The SPECWAR upper is for builders who want a rigid, monolithic platform for lights and lasers. Order it with our other AR-15 uppers from our Lubbock, Texas gun shop for fast, insured shipping.