RCBS Reloading Press Rock Chucker Supreme PRIMER CATCHER Upgrade. This was designed to fit the press with no tools or pins. It has clearances for any rough casings and should fit your press nicely. To install simply place left side of catcher in press casting groove and drop right side into position. I have never had it move through 1000 rounds. If it is too tight with your ram there is a small fillet at the bottom of the primer catch opening that can be gently sanded down. You will need to supply your own 1/2" or 13mm tubing. There is a plug included for the tubes bottom. These are 100% Made In The USA! Support Small Business!