RCBS Small Base 224 Valkyrie Taper Crimp Reloading Die Set - RCBS AR Series Die Sets are a must for progressive reloaders. They feature a Small Base Sizer Die designed for semi-automatic firearms, and a Taper Crimp Seater Die. The Small Base Sizer guarantees the cartridge will rechamber in AR-platform weapons Die Lock Wring Wrench Included; Quality Dies; AR Series;