This leads to the possibility of a failure to eject. I like the rims on my .357...The Pit Bull incorporates a spring-loaded lip of steel that makes full contact with the rim of the rimless cartridge. This allows the insertion and retention of the 9mm cartridge in each chamber of the cylinder. The system also allows the user to quickly eject the empties. There is no need for any half- or full-moon clips. The chambers of the cylinder are also stepped so the case mouth of the 9mm bottoms out or headspaces on the step and does not fall through the chamber.