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Webley .38 Mk IV is the murder weapon in "Ring Out Your Dead" (S5E3). One of its rounds was identified as "Enfield .38", but the shape of the front sight reveals this weapon as a Webley.
In "Four Funerals and a Wedding" (S9E5) Tom Barnaby (John Nettles), who is a guest of honor on the fair in Broughton, fires a blank-firing revolver to start the race. This revolver looks like a converted Webley .38 Mk IV with 4" barrel though it differs in several details including the shape of trigger guard.
Webley .455 Mk VI
Webley .455 Mk VI is seen in "Shot at Dawn" (S11E1) both in the flashback scene that takes place during the WW1 and in modern time. The revolver was carried by Lt. Duggie Hammond (Josh Stanley) in 1916, before being preserved in the Hammond family museum and later used to commit murder. The police expert correctly identyfied it as "a .455 service revolver produced about 1916".
Smith & Wesson Victory Model
A Smith & Wesson Victory Model is found near the 45-years-old remains of Duncan Palmer in "Death in the Slow Lane" (S14E1). In the flashback scene the revolver is seen in hands of the murderer.
Bruni Olympic 6
A Bruni Olympic 6 blank-firing starting revolver is fired to start the Midsomer Regatta in "Dead in the Water" (S8E2).
A very old-fashioned revolver is seen in Frances Le Bon's (Gwen Taylor) collection of old handguns in "Ring Out Your Dead" (S5E3). It looks like a so-called "transitional" revolver of mid XIX century (like Butterfield or Westley Richard revolvers).
Unidentified revolver 2
A long-barreled old-fashioned revolver is seen in Frances Le Bon's (Gwen Taylor) collection of old handguns in "Ring Out Your Dead" (S5E3).
Pistols
Bruni 1911
A Bruni 1911 8mm blank firing replica of the M1911A1 is carried (but never used) by Sean O'Connell (Sean McGinley) is "Who Killed Cock Robin?" (S4E4).
Beretta 92SB
Beretta 92SB is used by Tony Carter (Matthew Marsh) during the bank robbery in "Painted in Blood" (S6E3). Its round trigger guard and the shape of the front sight match 92SB model but due to strict UK firearms law this pistol is supposed to be a blank firing version.
Beretta 92FS
In the opening scene of "Days of Misrule" (S11E6) Alec Grainger (uncredited) aims a pisol at James Parkes (Joseph Millson). The pistol seems to be Beretta 92FS but it isn't seen clear enough to be identified for sure.
Browning Hi-Power
A Browning Hi-Power used to commit murder 18 years previously is found an abandoned house's chimney in "The House in the Woods" (S9E1).
Umarex RWS C225
Frances Le Bon (Gwen Taylor) owns two Umarex RWS C225 Target pistols (CO2 powered air pistols based on the SIG-Sauer P225) in "Ring Out Your Dead" (S5E3). She correctly identifies them as "sporting pistols, not living weapons", and then "gas replicas".
Shotguns
Double Barreled Side by Side Shotgun
Double barreled side by side shotguns are seen in many episodes, either for hunting or murder. In "Ghosts of Christmas Past" (S7E7) and in "A Rare Bird" (S14E8) shotguns are identified as 12 gauge while in other episodes the caliber is not mentioned.
A Single Barreled Shotgun is a hunting weapon of Byron Street (Bernard Lloyd) in "The Night of the Stag" (S14E6). In the final scene of this episode Smudgepot (Francis Magee), Samuel Quested's (Warren Clarke) henchman, holds the Street's shotgun but is disarmed by Chief Inspector John Barnaby (Neil Dudgeon).
Rifles
FN Trombone
A pump action .22 rifle is used by a trio of yound hoodlums during their night hunt in "The Green Man" (S7E1). Later this weapon is used to kill two of them. Due to the design of the pump, the large screw on the receiver and the shape of the ejection port it can be identified as an FN Trombone.
Steyr Mannlicher .22-250 rifle
A smallbore bolt action rifle is seen in "Vixen’s Run" (S9E3). The old gamekeeper Amos Brown (Leslie Schofield) calls the rifle "Mannlicher .22-250". It is supposed to be a Steyr Mannlicher Model L.
Unidentified bolt action sniper rifles
Several bolt action sniper rifles are used during the shooting competition in the Broughton village in "Four Funerals and a Wedding" (S9E5). The rifles are supposedly of various models. One of these rifles is later used as a weapon of murder.
Martini-Henry rifle
Two rifles are seen on the wall of the pub in "Destroying angel" (S4E2) and "Who Killed Cock Robin?" (S4E4): a Martini-Henry and a Lee-Enfield No.1 Mk.III*.
Lee-Enfield No.1 Mk.III*
A Lee-Enfield No.1 Mk.III* is seen on the pub wall in "Destroying Angel" (S4E2) and "Who Killed Cock Robin?" (S4E4). Lee-Enfield No.1 Mk.III* are also seen in "Shot at Dawn" (S11E1), both in the 1916 flashback and in the present.
Jack Tewson (Tony Haygarth) is seen with a bolt action sniper rifle in "King's Crystal" (S10E3) that appears to be a sporterised Lee-Enfield rifle.
Assault Rifles
Enfield L85
Enfield L85 assault rifles are seen in the depot of the Territorial Army unit in "A Tale of Two Hamlets" (S6E4). They are supposed to be training mockups, not real rifles. In "Days of Misrule" (S11E6) L85s are seen in hands of Territorial Army soldiers during the night training.
Heckler & Koch G3
In the flashback scene in "A Sacred Trust" (S14E7) that takes place during the war in some African country two white mercenaries are armed with Heckler & Koch G3 assault rifles. This scene is intentionally made with low quality (reflecting memories of one of the characters), so the exact model of G3 is difficult to be identified.
AK-47
In the flashback scene in "A Sacred Trust" (S14E7) that takes place during the war in some African country several native soldiers carry AK-47 assault rifles. This scene is intentionally made with low quality (reflecting memories of one of the characters).
AKS-47
In the flashback scene in "A Sacred Trust" (S14E7) that takes place during the war in some African country several native soldiers carry AKS-47 assault rifles. This scene is intentionally made with low quality (reflecting memories of one of the characters).
Unidentified AK version
During the 1980s Berlin flashback in "Secrets and Spies" (S12E3), East German soldiers carry AK-style assault rifles. They are seen very briefly and are possibly airsoft guns.
Machine Guns
Vickers Mk1
A Vickers Mk1 machine gun is used as a murder weapon in "Shot at Dawn" (S11E1).
Browining L3A3 (M1919A4)
An L3A3, UK version of Browning M1919A4 machine gun in .303 caliber, is seen in the turret of Ferret Mk 2 armoured car in "Dance with the Dead" (S10E1). It may be a real machine gun or a mockup of the barrel.
Other weapons
Flintlock pistol
A flintlock pistol is seen on the wall of the pub in "Dead Man's Eleven" (S2E3). It is also seen in "Second Sight" (S8E5) where the same decoration is used for another pub.
Flintlock Musket
Flintlock muskets are seen during the filming of the historical movie about the French Revolution in the opening scene in "They Seek Him Here" (S10E7).
Blunderbuss
Munro Hilliard (John Nettleton) carries a flintlock blunderbuss in one scene in "Orchis Fatalis" (S8E3).
Pepperbox revolver
A pepperbox revolver is seen in Frances Le Bon's (Gwen Taylor) collection of old handguns in "Ring Out Your Dead" (S5E3). It looks similar to Allen & Thurber Pepperbox but cannot be identified for sure.