RCBS AR Series Die Sets feature a Small Base Sizer Die designed for semi-automatic firearms. The Small Base Sizer guarantees the cartridge will rechamber in AR-platform firearms. The AR Series Die Set also feature a rifle Taper Crimp Seat Die.

• Features a Small Base Size Die to insure feeding in semi-automatic firearms
• Taper Crimp Seat Die crimps bullets so they will not move during recoil
• Unique 7-degree crimp angle designed for taper crimps in autoloading rifles