The new RCBS AR Series is a must for the progressive reloader. It features a Small Base sizing die and a new Taper Crimp seating die. This combination makes reloading easier for AR-style or semi-auto shooters. The small Base sizer guarantees that the cartridge will rechamber. The Taper Crimp Seater is more forgiving when various case lengths are loaded at the same time. Case neck crimp bulges and buckled shoulders are virtually eliminated when Taper crimping is used with cannelured bullets. 2 Die Set Includes: a Small Base Full Length Sizing Die a Taper Crimp Seating Die Shell Holder/Shell Plate Sold Separately Shell Holder #32 / Item Number #RC09232 Shell Plate #32