Peter Jackson's King Kong: The Official Game of the Movie

M1928 Thompson

The Tommy Gun is capable of firing a 50 round drum, first used just before the first V-Rex attack.

M1928 "Tommygun" .45 ACP

Gewehr 98

The Gewehr 98 is capable of firing long distance and is used as a sniper ingame. It is first available at the point that you need to wait for Carl and Hayes to lower a bridge. It is obvious that this was one of the rifles favored by the Germans in WWI. Like the Luger in the game, Englehorn likely acquired it from either war surplus or stole it during the First World War.

Mauser Gewehr 1898 7.92x57mm Mauser

The only thing is the bolt is only cranked when reloading. Reloading itself is rather odd, as only one round is loaded into the rifle.

Winchester M1897

Winchester Model 1897 12 gauge riot gun

The Winchester M1897 is first capable is being used at the end of the first level and is then used to blast away giant enemy crabs.

Luger P08

Artillery Model Luger P08 (with long barrel) - 9mm

The Luger P08 is the German pistol of WWI. It is available sometime at the Start of the Game.