Godzilla is the 2014 American "re-imagining" of the Japanese monster film franchise. The film was directed by Gareth Edwards (Rogue One) and the cast includes Aaron Taylor-Johnson, Bryan Cranston, Ken Watanabe, and Juliette Binoche. This feature is the first of Warner Brother's planned "Monster-Verse," which includes 2017's Kong: Skull Island, at least one confirmed direct sequel, Godzilla: King of the Monsters; as well as a crossover film Godzilla vs Kong, which will pit the kaiju against perhaps his most famous rival.
The following weapons were used in the film Godzilla (2014):
US military personnel in the film, including Lt. Ford Brody (Aaron Taylor-Johnson), carry the Beretta 92FS (standing in for the Beretta M9) as their sidearm. Brody draws his pistol to protect himself from the female MUTO.
The M4A1 is carried by the majority of the US military seen in the film including Lt. Ford Brody (Aaron Taylor-Johnson). While on the train, the M4 he uses is configured with an EOTech 552 sight and AN/PEQ-2 laser module. But when parachuting into San Francisco, he uses one fitted with the newer EOTech 553 and AN/PEQ-15 ATPIAL.
Filipino excavation site guards at the beginning of the film carry AKMs.
Howa Type 89
The Monarch security personnel at the former Janjira nuclear power plant site are all armed with Howa Type 89 rifles fitted with flashlights. Since the movie was filmed in British Columbia, and since the Type 89 was never exported outside of Japan, it is quite likely that the rifles used in the film were airsoft replicas.
Browning M2 Heavy Machine Gun
The Browning M2 is seen mounted on a US Navy ships, M1 Abrams tanks and US humvees.
What appears to be an FN MAG is seen mounted on Army Trucks Inc's ersatz M1 Abrams prop vehicles, which are actually visually modified Chieftain tanks.
Heckler & Koch MP5A3
SWAT officers in Honolulu are seen using the Heckler & Koch MP5A3 during Godzilla's landfall in Hawaii.
M203 Grenade Launcher
Several soldiers have M203 grenade launchers mounted to their M4A1 carbines.
The M136 AT4 is used by US troops notably on the San Francisco–Oakland Bay Bridge.
Mk 19 grenade launcher