No need to wait for ballistics. Presuming that silencers actually worked, you can eliminate anyoone who carried a revolver (the cylinder gap would still emit the flash and sound); now just check the muzzles of the remaining automatics, the barrel of the silenced pistol would have to be modified to let the silencer screw on. The person with the modified pistol is the shooter
No need to wait for ballistics. Presuming that silencers actually worked, you can eliminate anyoone who carried a revolver (the cylinder gap would still emit the flash and sound); now just check the muzzles of the remaining automatics, the barrel of the silenced pistol would have to be modified to let the silencer screw on. The person with the modified pistol is the shooter