Gorgo is a British 1961 science fiction monster movie directed by Eugène Lourié. It is the third Lourié's monster movie after The Beast from 20,000 Fathoms (1953) and The Giant Behemoth (1959). After a volcanic eruption off Ireland coast a monster appears from the ocean. Two treasure divers manage to capture the creature and sell it to London circus where it is made the star attraction. After the monster, nicknamed Gorgo, is examined by scientists, they find out that this is just a infant of its species. Soon an adult monster Ogra raises from the deep and moves to London to resque the small one.
The following weapons were used in the film Gorgo:
Sten Mk II
Some British soldiers are armed with Sten Mk II SMGs.
During the defence of the Tower Bridge several soldiers fire MP40 SMGs (this weapon was never issued to British military). The blue muzzle flash indicates the weapon to be a prop using natural gas to create muzzle flash, similar to Stens in The Guns of_Navarone.
Lee-Enfield No.4 Mk.I
When Gorgo comes ashore on Nara Island, the harbour master McCartin (Christopher Rhodes) and two fishermen fire Lee-Enfield No.4 Mk.I rifles (of course, without any success). A No.4 Mk.I rifle is seen on board of Joe Ryan's MV Triton. British soldiers widely use No.4 Mk.I rifles when Ogra goes on a rampage in London.
Lee-Enfield No.1 Mk.III*
Some Lee-Enfield No.1 Mk.III* are also seen in hands of British soldiers.
Machine Guns and Autocannons
Besa Machine Gun
Besa machine guns are coaxial mounted on Daimler Armoured Cars Mk I.
Browning M1919A4 machine guns (British Army index L3) are mounted on Centurion (most likely Mark 5 or Mark 7) tanks.
What appears to be Bren gun is seen top-mounted on a Centurion tank.
Oerlikon 20mm Cannon
A Oerlikon 20mm Cannon is seen mounted on US Navy submarine.
AN/M3, US version of Hispano-Suiza HS.404 20mm autocannon, are mounted on Grumman F9F Panther fighter planes, seen on US Navy aircraft carrier that stands for HMS Royal Oak (in reality no Royal Navy aircraft carrier had such name).
ADEN cannons are mounted on RAF Hawker Hunter fighter planes.
Bofors 40mm AA autocannons are mounted on various Royal Navy and US Navy ships, notably HMS Pellew (F62) that is intensively used in attack on Ogra.
Webley & Scott No. 1 Mk. III* Signal Pistol
A Royal Navy sailor uses a Webley & Scott No. 1 Mk. III* Signal Pistol to ignite the petrol trap when Ogra enters River Thames.
Webley & Scott No. 4 Mk. I Signal Pistol
A British soldier uses a Webley & Scott No. 4 Mk. I Signal Pistol during the defence of the Tower Bridge.
The circus personnel use flamethrowers to threaten Gorgo and stop its attempts to break free. They appear to be a kind of non-military propane-fueled flamethrowers.
Centurion Main Battle Tank
Centurion Mark 5 or Mark 7 tanks are deployed against Ogra during the defence of Tower Bridge. Their main guns are 105mm L7.
Daimler Armoured Car Mk I
Daimler Armoured Cars Mk I are also deployed against Ogra. Their 2-pounder (40mm) guns are inferior in comparison with 105mm guns of Centurion tanks.
FV603 Saracen APCs are also used by British Army.
During the defence of the Palace of Westminster British troops use car-mounted missiles. While the missiles doesn't match any real weapon, issued to British Army, they are more than just mockup, as they are loaded and fired. Possibly it's a kind of pyrotechnic rockets.