RCBS AR Series Die Sets are a must-have for progressive reloaders who demand precision and performance. These sets include a Small Base Sizer Die specifically designed for semi-automatic firearms, ensuring that your cartridges will reliably rechamber in AR-platform rifles. The Small Base Sizer Die eliminates feeding issues, offering smooth and consistent performance. The Taper Crimp Seater Die is designed to securely seat the bullet and apply the appropriate crimp, ensuring reliable ignition and optimal performance. Perfect for reloaders looking to achieve top-tier reliability and accuracy in their AR-platform firearms.