RCBS AR Series Small Base 2-Die Set .223 Remington Taper Crimp

The RCBS AR Series Small Base 2-Die Set is purpose-built for reloading .223 Remington ammunition for AR-style and semi-automatic rifles. This 2-die combination pairs a small base sizing die with a taper crimp bullet seater, solving two common pain points for AR-15 reloaders: case dimension consistency for reliable feeding and proper crimp without distorting the cartridge shoulder.

The small base sizer is the heart of this set. It sizes fired brass down to minimum specifications that are tighter than SAAMI, which is critical for reliable function in semi-auto actions and magazines that can be picky about case head and body diameter. The result is ammunition that chambers smoothly in AR-platform rifles where standard full-length sizing often leaves cases just a touch too large for dependable feeding.

The matching seater die features RCBS's signature 7-degree taper crimp shoulder instead of a traditional roll crimp. Taper crimping is the right choice for bottleneck rifle cartridges like the .223 Remington: it removes the bell from the case mouth without pushing the shoulder back, preserving overall length and helping every round feed the same way. The integrated seating stem seats and crimps in a single, consistent operation.

Both dies are finished to RCBS quality standards, made in the USA, and threaded 7/8x14 so they drop right into any single stage or turret press that accepts standard reloading die threads. They ship in the distinctive black RCBS die box for organized storage on your reloading bench.

Whether you are loading bulk plinking ammo for an AR-15 or dialing in match-grade handloads for competition, the RCBS 11107 AR Series Small Base Die Set delivers the case prep and crimp control that semi-auto platforms demand.