King Kong (2005)
The following weapons were used in the film King Kong (2005):
Luger P08 "Artillery"
The skipper of the S.S. Venture, Captain Englehorn (Thomas Kretschmann) is seen using a long barreled Luger P08 "Artillery" model to shoot a Skull Island native just as the native was about to kill Carl Denham (Jack Black).
Smith & Wesson Military & Police
The M1928 Thompson is used by Jack Driscoll (Adrien Brody), First Mate Ben Hayes (Evan Parke), Lumpy the Cook (Andy Serkis), Bruce Baxter (Kyle Chandler), and various members of the crew of the S.S. Venture during the mission to rescue Ann Darrow (Naomi Watts). Jimmy (Jamie Bell) also uses a Thompson to shoot the Weta-rexes off of Jack when in the insect pit. The Thompsons seen in the film have the classic 'gangster' configuration; vertical foregrips, Cutts compensators, charging handle on the top, and high-capacity 50 round drum magazines.
It would be a task to correctly identify if the Thompsons used in the film are 1921AC (compensated), 1928 "overstamp" from 1921 Colt, or 1928A1s with vertical grip added for the film to give them the earlier look. However, it is logical to assume that these are actually WWII M1928A1s with make-overs in order to give the appearance of the earlier pre-war Colt guns. Also, the M1928 Thompson was already in production and was widely available during the time period the film was set in (early 1930s), so the use of the M1928 Thompsons by the crew of the S.S. Venture is authentic to the period of time.
Mauser Gewehr 1898
Another weapon used by the crew of the S.S. Venture is the German-made Mauser Gewehr 1898 bolt-action rifle. Though firing a more powerful round (7.92x57mm Mauser), they tend to be less effective in the film overall than the rapid-fire Thompsons, possibly due to the Gewehr 1898's straight bolt handle (which slows down reload time compared to the rate of fire of a bolt-action rifle that has a turned-down bolt handle), "cock on opening" bolt-action and five-round magazine. Carl Denham (Jack Black) is also seen using a Gewehr 1898 rifle as a club against the giant insects in the chasm.
Several U.S. Army soldiers are armed with M1917 Enfield bolt-action rifles.
Browning Automatic Rifle
In the extended edition of the film, a soldier armed with a Browning Automatic Rifle in the back of a military truck is telling his fellow comrades what they will do to Kong before the giant ape runs into the vehicle, and smashes it into a wall. Note that the gun is a BAR M1918A2 with bipod removed, anachronistic to the film's 1930s setting. A BAR M1918 would have been correct.
The Browning AN/M2 heavy machine gun can be seen mounted on Navy-flown Curtiss F8C-5/O2C-1 Helldiver biplanes as the primary armament.
During the climax of the film, the Curtiss F8C-5/O2C-1 Helldiver biplanes that attack Kong on the Empire State Building are fitted with Lewis guns for the observer/tail gunner. Like virtually all aircraft-mounted Lewis guns, the version used on the biplanes in the film had the cooling shrouds removed from their barrels.
In the scene where Kong is pursued from Central Park to the Empire State Building, U.S. Army soldiers are seen firing at the giant ape with a Browning M1919A4 machine gun mounted in the back of a car. Some are also mounted on the top of U.S. Army cars facing the Empire State Building. The model shown, the M1919A4, is somewhat anachronistic for 1933 however.
Enfield 13-pdr 9-cwt Mk I
While Kong is being pursued through New York City, U.S. Army soldiers fire at him with the Enfield 13-pdr 9-cwt Mk I (QF 13-pounder 9-cwt) mounted on several military trucks. This was a First World War adaption of obsolete 13-pounder cannon as air defense weapons, hence the high angle mounting shown on the truck. The weapon is of three inch (76mm) caliber; the "9-cwt" indicating the barrel/breech assembly weighs nine hundredweight and differentiates this model weapon from other "thirteen pounders".
The Fighter Planes used to attack Kong in the film were Curtiss F8C-5/O2C-1 Helldivers.