DCI John Luther (Idris Elba) keeps a Smith & Wesson Model 12 in his apartment. In Episode 1 he is shown to use it every morning to play a deadly game of Russian Roulette before heading to work. In Episode 2, Alice Morgan (Ruth Wilson) discovers the weapon after breaking into Luther's apartment.
Luther claims the weapon is his fathers former military service pistol, however the only Smith & Wesson variant issued to the British Army was the larger full barrelled Smith & Wesson Victory Model series during World War II.
Various CO19 snipers are seen armed with the Heckler & Koch PSG-1 during a standoff in Episode 4. The PSG-1 used in this episode appears to be a mock-up built from a full-auto G3 variant; it has the detachable push-pin lower receiver unit of H&K's full-auto weapons, whereas the factory PSG-1 has the none-detachable lower receiver of the HK91 civilian rifles. This weapon also has the lower receiver with "S-F" fire control options, rather than the "0-1" options of the factory PSG-1.
Nicholas and Robert Millberry (Steve Robertson) are seen using revolver style water pistol's filled with corrosive acid during their various attacks throughout London in Episode 3 and 4.
