ACI 5.56 NATO 8″ Barrel M-LOK Upper Receiver Assembly | U5568ML

The ACI U5568ML is a purpose-built 5.56 NATO upper receiver assembly designed for compact AR-platform builds that demand reliability without compromise. Featuring an 8-inch barrel and a free-floating M-LOK handguard, this upper provides a streamlined, accessory-ready foundation for pistol-length AR configurations or NFA-compliant short-barreled rifle (SBR) builds.

The M-LOK handguard interface gives you the flexibility to mount lights, lasers, grips, and other accessories exactly where you need them, keeping your build clean and customizable. The 5.56 NATO chambering offers broad ammunition compatibility, making this upper equally at home in a home defense build, a competition setup, or as a capable suppressor host.

**Key Features:**
– Chambered in 5.56 NATO for broad ammunition compatibility
– 8-inch barrel for a compact, maneuverable profile
– Free-floating M-LOK handguard for accessory versatility
– Solid foundation for pistol-length AR or SBR configurations
– Competitive pricing on a quality AR upper assembly

**Please Note:** An 8-inch barrel upper receiver assembly may be subject to NFA regulations depending on your intended configuration and lower receiver pairing (pistol vs. SBR). Always consult applicable federal, state, and local laws before completing your build. The knowledgeable team at Deep Roots Rifle Co is happy to assist with compliance questions.

At Deep Roots Rifle Co, we carry hard-to-find AR upper assemblies and components so you can build exactly what you need. Whether you’re an experienced builder or putting together your first AR, our expert staff in Eustis, Florida is ready to help. Order online at DeepRootsRifleCo.com with fast nationwide shipping, or stop by our Eustis, FL store to browse our full selection of AR uppers, components, and custom build services.