Daniel Defense® Custom Uppers & Parts

Welcome to PAI Defense, your authorized source for custom Daniel Defense upper receiver groups (URGs), replacement components, and modular armory hardware. Designed for institutional armorers, law enforcement agencies, and professional operators seeking specialized configurations, our inventory includes factory-direct URGs featuring iconic RIS II and RIS III M-LOK rails, cold hammer-forged barrels, and precision internal components. Whether your department requires fleet upgrades, maintenance spares, or specialized short-barreled upper configurations, we provide reliable, combat-proven hardware built to exact tactical standards.