Ebirah, Horror of the Deep

Rifle

This briefly-seen carbine (?) rifle is seen wielded by the bank robber Yoshimura (Akira Takarada) aboard the yacht. Ryota (Tooru Watanabe) renders it completely useless by dismantling it while Yoshimura is asleep.

Yoshimura holds the rifle on the intruders.

Agreeing to let them stay aboard, he hefts the rifle up.

Ryota reveals he took the rifle apart, showing Yoshimura the gun parts on a tray.

Yoshimura grabs the tray from Ryota, thoroughly displeased.

Fake M1A1 Thompson

The Red Bamboo soldiers primarily use Japanese 'flash paper' non-guns based on the M1A1 Thompson sub machine guns with large suppressor-like attachments on the ends of the barrel. For years the Japanese cinema has used their own version of 'flash paper' non guns since they for the most part, are not allowed real firearms, even their movie industry. Japanese flashpaper guns are identifiable due to the distinctive "pinkish" or "Reddish" color of the flash and the lack of ejecting brass and excessive smoke from the muzzle.

M1A1 Thompson with 30-round magazine .45 ACP

The Red Bamboo soldiers firing at escaping slaves.

Captain Ryuui (Akihiko Hirata) signals for his men to quit firing.

Ryuui and his men catch the castaways inside the Red Bamboo base. The soldier on the left has an M1A1 Thompson.

Rushing up some rocks in pursuit of the slave girl Dayo.

A decent view of one soldier's (left) Thompson as Ryuui reacts to the sudden intrusion of Godzilla.

Browning M1919

Seen used as sentry guns by the Red Bamboo.

Browning M1919 - .30-06

Sentry guns mounted on Red Bamboo guard towers fire after some escaping slaves.

Closer view.

MP40

A secondary firearm employed by the Red Bamboo is what appears to be the MP40.

MP40 9mm

Behind the soldier with the M1A1 Thompson.

Made-for-Movie Firearms

A few of the weapons seen in the hands of the Red Bamboo are obviously props either inspired by existing guns, or entirely fictional.

Ryuui's sidearm

Captain Ryuui (Akihiko Hirata) (named "Captain Yamoto" in the English dub) carries a chromed handgun as his primary sidearm. It appears to be an entirely fictional movie prop.

Ryuui gestures with his gun for his men to return to the ship.

The gun is visible in Ryuui's holster as the Red Bamboo run after Dayo.

Ryuui points his gun at some slaves after firing a few attention-getting shots.

Machine pistol

At least one Red Bamboo soldier is seen with a silver-colored machine pistol that resembles a chromed MP40.

Held by the soldier third from left.

Trivia

Special mention go to the flagrant disregard for proper firearm use demonstrated by the Red Bamboo, moreso than almost any other group of movie villains. They fire wildly while running together in tight groups, which is reckless and borderline suicidal. In particular in the scene of them chasing the escaping slaves on the beach where the Red Bamboo are running in a tightly-packed nearly single file configuration blasting away wildly. It's a wonder each man didn't kill the one in front of him. Further, when searching for the heroes on the island, they fire their weapons constantly at nothing in particular, which one would think would have the dual effect of both wasting their ammunition needlessly and loudly announcing their approach!