Roller bearings are incorporated into the upper portion and lower portion of an elongated trigger assembly of a firearm to provide a trigger pull with smooth operation and balance while reducing wear. The roller bearings roll along trigger tracks that are adjacent to the top and bottom of the trigger pull or are formed as slots in the trigger pull. A safety pin locks a barrel latch while the firearm discharges a round of ammunition. The barrel latch safety locking mechanism is incorporated into the frame and is actuated by the trigger assembly. An extractor assembly for rimless shells is incorporated into a barrel assembly of a breech loading firearm.