The LMT Defense MRP-L M-LOK 13.25" stripped upper receiver is the rifle-length powerhouse in the legendary Monolithic Rail Platform lineup, precision-machined from a single billet of high-grade aerospace aluminum to fuse the receiver and handguard into one ultra-rigid unit. This design eliminates flex-prone joints, delivering rock-solid zero retention for optics and accessories even under intense recoil or environmental stress, while providing a true free-float barrel setup that maximizes accuracy in precision shooting applications. Optimized for barrels from 14.5" up to 20" (ideal for mid-length or rifle-length gas systems), it supports calibers like 5.56x45 NATO, .300 Blackout, and others compatible with LMT's proprietary monolithic barrel assemblies, featuring secure dual T-30 Torx bolt locking for effortless, tool-minimal swaps. Equipped with M-LOK attachment points across all eight sides for lightweight, customizable mounting of grips, lights, bipods, lasers, and more, this upper includes a continuous full-length Picatinny top rail for unrestricted optics placement. It also incorporates four built-in QD sling swivel points for enhanced carry options, making it exceptionally versatile for duty rifles, designated marksman configurations, SPR builds, or long-range setups where stability and modularity are paramount. The MRP-L platform's battle-tested construction ensures unmatched durability, reduced weight compared to traditional two-piece systems, and superior heat dissipation during sustained fire. Renowned among military, law enforcement, and discerning civilian shooters for its reliability and innovation, the 13.25" MRP-L M-LOK upper excels in scenarios demanding extended reach, precision, and accessory integration without compromising structural integrity. This stripped receiver serves as the ideal foundation for a high-end AR-15 rifle tailored to rifle-length performance needs. Upgrade your AR-15 platform today with the LMT Defense MRP-L M-LOK 13.25" stripped upper receiver-available now at Battlehawk Armory for premium quality and fast shipping.