A conventional .38spl revolver alongside an improvised 2-shot alternative. On this example the rectangular barrel is swung to the side to load and is fired by flicking closed two spring loaded strikers with the thumb. Bog simple but effective.
This .380 automatic pistol was brandished on construction workers by a man living in a shipping container on site who had on several occasions entered the firm saying he could not stand the noise and dust that the trucks were making. After being arrested he told police that he had originally built the gun to defend himself.