Radian Weapons R0411 Builder Kit Radian Black, AX556 Ambi Lower, 14" Handgaurd, Includes Most Lower Parts

The Radian Weapons R0411 Builder Kit in Radian Black represents a complete foundation for those assembling a purpose-built AR15 platform. This receiver set combines a precision-machined ambidextrous lower with all essential lower parts included, eliminating sourcing delays and compatibility concerns common in component builds. The kit ships with a 14-inch handguard, providing the balance between maneuverability and sight radius preferred by operators who require a compact platform without sacrificing handling characteristics.

Built from billet aluminum, the Radian Black AX556 ambidextrous lower accommodates both left and right-handed shooters without sacrifice to ergonomics or control layout. The included lower parts kit eliminates guesswork during assembly, allowing builders to focus on upper receiver selection and barrel configuration based on intended application. At 5.54 lbs, the receiver set provides a substantial platform without excessive weight, critical for extended patrol or training cycles where fatigue compounds operational errors.

This builder kit suits law enforcement transition training programs, specialized unit builds, and civilian shooters who demand consistent quality in a modular platform. The 14-inch handguard length accommodates standard tactical rail systems and suppressor-height optic mounts without requiring specialized riser blocks, making accessory integration straightforward. Radian Weapons' engineering approach prioritizes dimensional consistency across production runs, reducing tolerance stack-up common in budget components—a practical advantage during high-round-count qualifications.