A firearm includes a magazine cavity in a handle defined by a frame. A stack of chamber tubes each holding a cartridge is loaded into the magazine cavity. A firing recess just to the rear of a bore defined in a firearm barrel receives the topmost chamber tube and cartridge and is urged against a partially circular contour defined within the recess by a feed spring which contour center is aligned with the bore. Each cartridge is fired while in its chamber tube by a firing mechanism and each chamber tube and fired cartridge are both ejected by gas pressure exerted on one side of the chamber tube through an ejection port defined by an opening in one side of the firing recess remote from the one side of the chamber tube. The ejection port allows a chamber tube positioned therein to be readily viewed or felt through the ejection port to make it possible to easily and reliably determine if the firearm is ready to be fired.