The LMT spec war upper receiver is engineered for optimal operational performance, developed in collaboration with elite American military personnel. It is compatible with the new 12-1/2 inches MRP barrel and other barrels measuring 12 inches or longer. Enhancements include the removal of built-in forward QD swivels and an extended length beyond the traditional CQB configuration, thereby improving ergonomics and accessory space. These modifications provide users with a tactical advantage and enhanced lethality. The spec war upper retains the classic barrel swap capability while emphasizing the need for a stable platform to support mounted laser aiming and illumination devices, essential for night operations. It features an M-LOK pattern rail mounting system and a continuous picatinny top rail. For users requiring a QD sling, a single attachment point is located at the rear of the receiver. Constructed from a single-piece of aerospace-grade aluminum, the patented LMT monolithic Rail Platform (MRP) upper receiver integrates the receiver and handguard. The barrel is secured using a proprietary locking system with two locking bolts accessible from the right side of the receiver requiring only a standard T-30 Torx bit for tightening. This receiver is designed to accommodate the patented LMT monolithic barrel assembly, which includes a low-profile gas block with a straight gas tube.

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These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

Local Law Compliance

Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.