A flat loop revolving firearm assembly can have a trigger mechanism configured to move a loop advance lever disposed between the trigger mechanism and a flat loop, and a hammer retractor lever disposed between the trigger mechanism and at least one hammer retractor bar. The hammer retractor bar can be configured to slide and contact a hammer thereby rotating the hammer to a cocked position and releasing the hammer to fire a cartridge removably disposed in a firing position chamber. The flat loop can have a plurality of flat loop links configured to revolve in parallel tracks into a firing position in response to motion imposed by the loop advance lever.