Torchwood agents Dr. Owen Harper (Burn Gorman), Ianto Jones (Gareth David-Lloyd), Toshiko Sato (Naoko Mori), Susie Costello (Indira Varma) and later Gwen Cooper (Eve Myles) carry the Tokyo Marui Hi Capa 4.3 (standing in for a real life compact M1911 variant). The airsoft guns were used due to strict firearms controls in the UK and the reduced insurance cost during filming. Government operatives, UNIT soldiers and minor characters are also seen with the weapon.
SIG-Sauer P226
A SIG-Sauer P226 is used by Gwen Cooper (Eve Myles) during firearms training in "Ghost Machine".
A M1911A1 is used by Huw (Rhys op Trefor), a corrupt police officer, when capturing Gwen and Owen in Countrycide.
Flintlock Pistol
A British Army solider soldier can be seen with a Flintlock Pistol during the Cardiff 1812 flashback in "Greeks Bearing Gifts".
Revolvers
Webley Mk. IV
Unlike most Torchwood personnel who uses the standard issue compact 1911 pistols, Captain Jack Harkness (John Barrowman) uses a Webley Mk IV in .38 as his primary weapon, presumably chosen to fit in with the characters WWII RAF fashion sense.
In Countrycide, a Remington 870 Shotgun fitted with wooden furniture, an extended magazine tube, rifled sights, and a shell holder is used by Kieran (Calum Callaghan) before he is taken by the cannibalistic villagers. Jack later uses the it when rescuing his team mates from the cannibals.
12 Gauge Double Barrelled Shotgun
A hammerless 12 Gauge Double Barrelled Shotgun is used by one of the cannibals named Helen Sherman (Maxine Evans) in Countrycide. In Greeks Bearing Gifts, a man planning to murder his family uses one, but is knocked out by Toshiko Sato (Naoko Mori) before he can use it.
Assault Rifles
Heckler & Koch G36C
The Heckler & Koch G36C is carried by British Army soldiers in "Day One". Although not accurate (as the British Army in reality carries the L85), it mirrors the continuity of Doctor Who where soldiers are seen carrying the same rifle.