The RCBS Rock Chucker Supreme Single Stage Press is a great press that is designed to turn out precision reloaded ammunition. To increase the efficiency of the Rock Chucker Supreme press RCBS developed the Auto Priming Unit. This tube fed priming system helps to speed up the single stage reloading process and ensure that primers do not get contaminated by oily fingers. Each tube will hold up to 100 primers and the reloaded is protected by accidental discharge with the included safety shield. Features: - Tube-fed priming system - Safety shield - Increases the speed of single-stage reloading - Eliminates handling of primers - 100-primer capacity - Push bar operation - Large and small primer pick up, feed tubes, and primer seat plugs included - Converts one-at-a-time priming to a tube-fed system and eliminates the handling of primers.