Quint (Robert Shaw) keeps an M1 Garand aboard his boat and is seen using it during the shark's night attack. Chief Martin Brody (Roy Scheider) uses the Garand against the shark at the climax of the film. Several Coast Guard members are also armed with M1s, most notably when they surround the two boys wearing a fake shark fin.
One of the men patrolling the waters on the Fourth of July is armed with an M1 Carbine. The rifle, which is often without a magazine loaded, appears to be fitted with adjustable rear sights as seen on post-WW2 M1 Carbines, but without the bayonet lug.
When posing with what they believe to be the shark causing all the carnage, one of the men in the group (at the far right) carries what appears to be an Arisaka Type 38. Not implausible; the movie was filmed in 1974 and war souvenir firearms were still very plentiful and affordable.
A Remington 700 is seen in the hands of another shark hunter posing with the shark. In a deleted scene, this person is seen holding the rifle as he fights with other hunters on the waters.
Another shark hunter is seen with what appears to be a a Winchester Model 62 .22 LR pump action rifle
Error creating thumbnail: File missingWinchester Model 62A Pump Action Rifle - 22 LR. Began production in 1940, was an upgrade to the Winchester Model 1906 pump action 22 rifle.Error creating thumbnail: File missingThe man in the glasses just behind Brody holds what appears to be a .22 Winchester rifle.
Handguns
Smith & Wesson Model 15
Chief Brody (Roy Scheider) uses a Smith & Wesson Model 15 revolver as his issued sidearm and uses it to fire several shots at the shark as it passes the Orca.
During the chaotic point in the movie, when the fishermen descend on the town in search of the reward on the shark, one of the hunters carries what looks like a Stevens 311A 12 Gauge Double Barreled Shotgun. This is from a deleted scene that can be viewed in the 30th Anniversary Edition's extras features.
The harpoon gun used by Quint (Robert Shaw) is a Greener Light Harpoon Gun with a nickel finish. He stores the rifle in its original take-down case, and the line holder has been removed from the forend and the reel is instead attached to the ship to handle bigger fish like sharks.
