The RCBS AR Taper Crimp Seater Die is part of the RCBS AR Series of dies that are specially designed for use with AR-style cases. This taper crimp seater die is made from hardened steel and, like all RCBS products, it was made with superior attention to detail to ensure durability and maximum performance. The RCBS AR Taper Crimp Seater Die is more forgiving than standard dies in crimping cartridge cases that have variable lengths. This die delivers the proper amount of crimp while reducing bulge and buckling for bullets with cannelure.