The Gemtech 13833 GVAC Upper Receiver delivers a ready-to-build platform for 5.56x45mm NATO rifles, featuring a Black finish, a 16.10" overall length, and a durable 15" M-LOK handguard that provides versatile accessory attachment and improved ergonomics. This upper receiver assembly is designed to enhance reliability and performance in rifle builds, pairing a Ferro-grade construction with a precise fit that ensures smooth cycling and consistent accuracy when paired with compatible components. Included components, such as the bolt carrier group and the ETM flash hider, streamline assembly and help manage muzzle flash for improved field performance in varied lighting conditions. The GVAC configuration supports modern enhancements while maintaining a clean, streamlined profile ideal for precision shooting, tactical applications, or sport shooting scenarios where modularity and reliability are paramount. With the Gemtech build quality and thoughtful integration of the handguard, flash device, and carrier group, shooters can expect a cohesive upper that harmonizes with a broad range of lower receivers and optics setups, enabling quick setup changes, reliable operation, and a confident shooting experience.