Sherlock Holmes: A Game of ShadowsSherlock Holmes: A Game of Shadows - Internet Movie Firearms Database - Guns in Movies, TV and Video GamesSherlock Holmes: A Game of Shadows
In the alleyway brawl, an attacker (uncredited) pulls a Webley Mk V on Sherlock Holmes (Robert Downey Jr.), but Holmes is able to take it away. Madam Simza Heron (Noomi Rapace) hands Holmes another one before he and Watson (Jude Law) infiltrate the Meinhard factory.
Webley Bulldog
Mary Watson (Kelly Reilly) pulls out Watson's Webley Bulldog on their honeymoon train. Dr. Watson later uses it to fend off the assassins.
Webley No. 5
Holmes fires upon the assassins with a what appears to be a Webley No.5 revolver before handing it off to Watson.
Sharps Model 1A Pepperbox
Sherlock Holmes (Robert Downey, Jr.) carries a Sharps Model 1A Pepperbox pistol while dressed in drag on the train to Brighton, and Watson (Jude Law) uses it to disable one of Moriarty's henchmen manning the machine gun.
Mauser M712 Schnellfeuer
Colonel Sebastian Moran (Paul Anderson) confronts Holmes with a Mauser M712 Schnellfeuer in the Meinhard factory. Holmes later uses one during the shootout in the factory. The use of this gun in the movie is anachronistic as it's set in 1891 and the Mauser C96 was first produced in 1896. Mauser M712 wasn't commercially available until 1932. It is implied that the C96 design is a prototype developed by Moriarty's weapons designers for the impending war he desires to start.
Mle 1892 Revolver
Anarchist Claude Ravache (Thierry Neuvic) shoots himself with a Mle 1892 Revolver. Watson later picks it up to confront the other anarchists. Watson still has this revolver, or another copy when he and Holmes infiltrate the Meinhard factory.
One of Moriarty's train hitmen tries to fire a Winchester Model 1887 shotgun on Holmes and Watson, but sets himself on fire due to Holmes' sabotage. When Moriarty's attacker squeezes the trigger, a scene shows rifled barrel, which is incorrect, since most of the scatterguns are smoothbore.
Rifles
Gewehr 1888
1888 Commission Rifles(Gewehr 88)s are used by the Meinhard guards and several men. Madam Simza, Holmes, Watson, and Moran use them during the factory escape.
Customized Martini-Henry Sniper Rifle
Col. Moran (Paul Anderson) uses a Customized Martini-Henry sniper rifle , which is fitting since he is an veteran of the Anglo-Afghan war. He's also described as the best shot in the army before his dismissal (which Watson erroneously refers to as a dishonorable discharge, which is reserved for enlisted men.)
Other
Maxim 1895
Two of Moriarty's gunmen man use a .303 British caliber Maxim 1895 with brass water jacket, and spade grips in an attempt to kill Dr. and Mrs. Watson.
No. 2 Mk II Hale Grenade
The assassins on the train are equipped with what appear to be modified No. 2 Mk II Hale Grenades. Holmes uses one to set a booby trap. This is another anachronism, as this weapon wasn't introduced until 1907.
Custom Submachine Gun
The train assassins and later Watson use what appear to be steampunk inspired custom submachine guns. They load from the top, and appear to be only capable of being fired from the hip. Their appearance was obviously, inspired by the Maxim 1895 lightweight.
Gatling Gun
Meinhard guards use Gatling Guns fed from Broadwell drums.
7.58 cm Minenwerfer
Meinhard guards attack the escaping party with 7.58 cm Minenwerfers. This is yet another anachronism, as this weapon wasn't introduced until 1909.
Trivia
.223 Shell Casing
Colonel Moran is shown assembling a poison dart cartridge using a modern Winchester .223 shell casing.