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 reloader is protected by accidental discharge with the included safety shield. FeaturesTube-fed priming systemSafety shieldIncreases the speed of single-stage reloadingEliminates handling of primers100-primer capacityPush bar operationLarge and small primer pick up, feed tubes, and primer seat plugs includedConverts one-at-a-time priming to a tube-fed system and eliminates the handling of primers