The Radian AX556 Builder Kit includes an 8.5-inch upper receiver in a brown finish, tailored for AR15 builds. This kit is designed to work with multi-caliber configurations and offers an elegant appearance combined with functionality.Key FeaturesAmbidextrous Controls: Designed for both left and right-handed shooters, enhancing usability.Quality Assurance: Assembled by a trained gunsmith, each unit is inspected and test-fired to ensure high standards.