- Crafted for precision and top-tier customization, the Radian Weapons A-DAC 15 Builder Kit stands out as a top choice for firearm enthusiasts aiming to design their own AR-15 platform. Manufactured by Radian Weapons, this builder kit embodies meticulous craftsmanship and an emphasis on quality. The inclusion of an 8.5" M-LOK free-float handguard offers superior adaptability for accessories, while the Radian A-DAC 15 Lower forms the core foundation for building a robust rifle.